March 22, 2026

Hawking Radiation, Dark Energy Dilemmas & Listener Curiosities

Hawking Radiation, Dark Energy Dilemmas & Listener Curiosities
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Cosmic Queries: Hawking Radiation, Dark Energy, and Moving Earth
In this engaging Q&A episode of Space Nuts, hosts Andrew Dunkley and Professor Fred Watson dive into intriguing listener questions that span the cosmos. From the mysteries of Hawking radiation to the enigma of dark energy, and even a thought-provoking "what if" scenario about moving Earth to a new star system, this episode is packed with fascinating discussions and astronomical insights.
Episode Highlights:
Hawking Radiation Explained: Tony from Marrickville poses a question about the entanglement of particles that pop into existence near black holes. Andrew and Fred explore the concept of quantum entanglement and how it relates to Hawking radiation, shedding light on this complex phenomenon.
Understanding Dark Energy: Stuart Gary Gary from Tasmania asks about the implications of dark energy and its role in the universe's expansion. The hosts discuss current theories, including the cosmological constant, and unravel the mysteries surrounding this elusive form of energy.
What If We Could Move Earth? Thomas from Virginia presents a thought-provoking scenario about relocating Earth to another star's Goldilocks zone. Andrew and Fred contemplate the potential effects on Earth's atmosphere during such a journey, drawing parallels to science fiction while grounding the discussion in scientific principles.

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Stay curious, keep looking up, and join us next time for more stellar insights and cosmic wonders. Until then, clear skies and happy stargazing.

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WEBVTT

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Hello again, thanks for joining us on Space Nuts. This

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is a Q and A edition. My name is Andrew Dunkley,

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00:00:05.719 --> 00:00:08.240
and it's always good to have your company wherever you

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00:00:08.320 --> 00:00:13.240
are in the world. Today we're going to be answering

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00:00:13.359 --> 00:00:17.359
questions from our audience, and we've got a question from

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00:00:17.399 --> 00:00:22.000
Tony about Hawking radiation. Stewart has asked a question about

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something we've never discussed before, or have we discussed it

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a million times. It's called dark energy, and Thomas wants

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00:00:29.359 --> 00:00:31.719
to know what would happen if we could just, you know,

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move Earth over there. All of those questions will be

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answered on today's episode of Space Nuts fifteen seconds. Guidance

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is in Channel ten nine ignition sequence Space Nuts NY

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or three.

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Two more Redio one Space Nuts as the night report.

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It Bill's good, He's back for more. His name is

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Professor Accred. What's on a at Large? Hello Fred?

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Hello Andrew? How are you after all that technical?

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Normally we record two episodes back to back with only

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moments in between, but today it was a very different story.

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The Internet would not cooperate. Space doesn't cooperate either. I

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think they were in collusion. So yeah, that left us

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high and drive. But it gave me time to make

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a cup of copy. Very good there it is, So.

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I've got one too.

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Yes, I love coffee. I'm a nut for it. So

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let's get stuck into some questions, shall we fret? Oh,

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before we do, though, we have a sort of an

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answer to one of our questions. We got a question

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from Andy in London not so long ago, and we

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dealt with his interests. But he mentioned that he's a

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train driver and I just said, tell us more about

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your job, really interested to learn, and he said us

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a little bit of info about his job. And I

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like that we can do this. I think you know,

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we've created, or they've created themselves, this interesting environment where

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a lot of the listeners can talk to each other

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on our podcast group on Facebook, and it's nice to

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get to know a few people. So this is Andy

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the train driver from London.

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Hi, guys, this is Andy the train driver from London.

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Thanks for answering my question. Much appreciate. Just we need

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to go back to regarding the question about trains. Yeah,

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so I live in West Sussex, but I actually work

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near Nord Junction on the London Bridge Line and I

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drive too tart the trains one electric, one diesel. Both

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are about fifty tons per coach, so longest trainer driver

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is twelve coaches long, and so that craates to about six

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hundred tons. The diesel trains, I've drive them from London

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Bridge down to West Sussex to a place called Uckfield,

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and they are they've got one engine per coach. These

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engines are pretty similar to like a double decker bus

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engine like eleven liter turbo charged. So the longest train

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to drive down there is ten coaches. So you've got

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ten eleven liter turbo engines all roaring away at the

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same time. Sounds quite impressive. Yep.

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I've been doing it.

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Twenty two years and I'm also an instructor, so a

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teacher with the new recruits how to drive these trains.

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I also do the DC lines and the AC lines,

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which are the overhead cables twenty five thousand vaults, and

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I'll drive the electric trains over to Watford up to

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one hundred miles an hour.

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So yeah, it's a good job. I enjoy it.

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I also enjoy your podcast, So thanks well for everything

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you do and I hope I answered your questions.

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Have good day, guys, So you like to buy. Thanks Andy.

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I know that's got nothing to do with astronomy or

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space science, but I just thought it was so good

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of him to tell us a little bit about his

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amazing life and his amazing job. And how many jobs

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do you know, Fred were you're allowed to do over

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one hundred miles an hour? I mean, well you paid

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to do it as well. Yeah, what a great gig. Jeez, Andy,

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thanks a lot. That was fantastic. I really enjoyed hearing

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about you. My next door neighbors are retired train driver,

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so I'm going to get him over here and let

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him hear that, because I think he'd be absolutely intrigued,

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and because there's been a lot of local interest lately,

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because the whole set of new trains are being built

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in Dubbo for the regional lines, and I actually spotted

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one yesterday out doing a trial run and it's very quiet.

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I thought, I heard this sound, went what is that?

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And I had a look and it whispered past. It

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was really amazing, and Andy would be interested to know.

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These these new trains that they're putting on regional New

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South Wales tracks are hybrids, so it'll run diesel from

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here to the city. Of liftgo and then they'll pop

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up the electric connector and run on school electric group. Yeah, yeah,

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and they'll run They'll run to Sydney on the electricty Wine,

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which is awesome. So yeah, lots of I love trains,

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and Judy's dad was a station master, so we've got

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a bit of a connection with trains in our family

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and next door. As it turns out, we better get

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down to it though, Fred, We've got a bunch of

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questions to go through. And here's the first one. Hi.

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Lad's Shane here from Oil and and I have a

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question regarding interstellar comets three atlas. I recently read an

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article that stated new studies indicate common at three I

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atlas could potentially be nearly as old as the universe itself.

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This got me to thinking about how comet can exist

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for so long, potentially thirteen billion years or so, and

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not burn up completely as it passes through solar systems.

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Even if it is as large as a few kilometers

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in diameter, it must burn off debris at an alarming

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rate for it to have a coma thousands of kilometers

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in length that can be seen from Earth. My guess

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is that it has probably spent ninety nine percent of

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its time in freezing into stellar space, but even at

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one percent of the time spent passing through other solar

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systems should be enough to make it evaporate. Love the show,

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keep up the good work over and out, Shane. Thank

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you Shane, and happy Saint Patrick's Day, which was yesterday

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our time, and all the golfers at our course were

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dressed in green. So yeah, that was fun except me

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because I forgot. But yeah, the interesting question by Shane

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is that a thing that the Three Eye Atlas could

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be that old.

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Yeah, it's really interesting that there's new information coming out

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all the time about how different three Eye atlases to

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the comets in our own solar system. In fact, I

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just saw one while we were off air, as you

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were desperately trying to fix the fix the interweb there.

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I got a new story which is about the water

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content of Three Eye Atlas and is a ratio of

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normal to heavy water, which I haven't read yet, but

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it's again it's an outlier, just like so many of

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its attributes are outliers. I haven't seen reports that it

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might be as old as the universe. It clearly won't

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be as old as you know, it has to be

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middle aged in the sense that some of the ice

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is that we see in it are complex molecules. There's

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the sort of chemical mix that we see in the

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solar system, except their extremes in the way these you know,

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the ratios of one to the other, and for those

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elements all to be there, you must be talking about

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a solar system its origin being in a solar system

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that is relatively rich in these elements, and that means

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it's not something in the very early universe where most

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you know, there was just hydrogen, helium and iron were

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the most common constituents. It's got all the sort of

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array of chemistry or chemical elements that we are used

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to in the solar system. So I think it's fair

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to say it's probably old, but I'm not going to

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hazard a guess on how old it is.

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I've seen had a quick look for it in as

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at March twenty twenty six. According to Live Science, it's

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possibly ten to twelve billion years old. They think that's

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a lot that's old.

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Yeah, but you've got to balance that against the fact

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that it does have you know, it does have a

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chemical composition in terms of the elements that are present,

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the abundances of the elements. That's not too different from ours.

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But that's clearly something that the pundits are working on.

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I think the nub of.

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Change question is I think his estimate of ninety nine

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point ninety nine percent of its time being in deep

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space and one percent being passing through a solar system.

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I suspect that's probably wildly wrong, because I suspect that

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it's more like ninety nine point nine nine nine nine

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nine nine nine nine nine percent in deep space and

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a tiny fraction that would be passing through solar systems.

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And what makes me say that is that space is big.

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There's a lot of empty space out there, and the

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solar systems are Yes, they're everywhere we see them, you know,

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we can see stars and planets and all the rest

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of it, but the space between them is immense. And

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so yeah, I think it's understandable that an object as

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old as that, let's say ten to twelve billion years,

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that could well have been an object that has kept

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most of its primordial ice. I don't think a lot

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is going to depend on how near it passes to

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a star. When it's when it's going through a solar system.

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That's the crucial thing. How much radiation is it feeling

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from the star? How much of its ice sublimes into space,

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And it's a fairly small fraction I think of the

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total mass. I have seen work on trying to understand

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comets in our own solar system in terms of how

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many times if passed near the Sun, and that what

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the sort of mass loss has resulted from that. But

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they are falling in from the oat cloud, so their

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orbits are quite different from Three Eye Atlas, which is

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hurtling through the Solar system at sixty sixty odd kilometers

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per second. It's nowhere near the Sun in that regard,

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so and it doesn't have a big tail.

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It does.

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The images that we see show a short, stubby tail

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with the coma, So there is material coming off it.

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I wouldn't like to hazard I guess as to how much.

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And I don't even know whether there's a reasonable estimate

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as to what the size of three Eye atlases in

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terms of the size of its nucleus the icy bit, Yeah,

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you might be able to find that out as well.

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In terms of diameter, it's four hundred and forty meters

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hang on a say, it's got all sorts of different numbers. Here,

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based on twenty twenty five Hubble Space Telescope of observations,

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the nucleus of the comet is between four hundred and

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forty meters and five point six kilo meters in diameter.

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Yeah, it's pretty hard to be. Yeah, that's right, because

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we don't see the nucleus itself. We just see the

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coma around the nucleus as the dark gases. But you know,

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maybe when it set off it was tril the size

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of that, who knows, But yeah, I think it's it's

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an interesting question that Shane poses, but I think it's

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it probably all makes sense. I think that the numbers

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kind of add up, even if it is very very old.

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Yeah, I'm sure. And how fast did you say? Sixty

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kilometers a.

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Second something like that? Yes, it's in that.

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That's nearly as fast as Andy the train driver.

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Well that's right.

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Yeah, all right, So there it is, Shane. Thanks for

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the question. Hopefully we adequately answered it for you. Our

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next question comes from somebody else, Hi, Professor Fred and Andrew.

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My question is concerning Hawking radiation, when two quantum particles

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pop into existence from a black hole. Are the particles entangled?

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If not, why also you inform an educators so well?

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So I thought I would share some remarkable stats I

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read the other day. The surface of the sun is

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very noisy. Forget the vacuum thingy for a minute. The

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Sun's surface apparently crackles away at one hundred decer bells

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give or take. The light from the sun takes approximately

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eight minutes to reach us. However, the sound of the

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crackling sun would not reach us for thirteen years. I

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love your show, Tony from Marrickville in New South Wales

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PS looking forward to Professor the Professor's next Belrose presentation.

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What's that about, Fred?

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Well, we've been doing this for quite a long time,

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something called Fred Watson pre sense and is a sporadic thing.

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We put on a talk money of course, the mastermind

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behind all this arranges it. We've got a place in Belrose,

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not very far from where we live here in Davidson

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in the Northern Beaches, and there's a nice bowling club

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there and we can't They've got a room which actually

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has a great screen, and I give talks from time

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to time. Once in a while we get a guest

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speaker as well, who gives au talk. So we maybe

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do three or four a year something like that.

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Lovely, very nice. Well that's what he's talking about. Those

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sun statistics are very interesting, and you and I have

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talked about how loud the sun is before, so it's

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a good thing we can't hear at all, you know,

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we've been in trouble. But his question was about Hawking radiation.

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When two quantum particles pop into existence from a black hole,

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are the particles entangled? If not? Why not? Yeah, so

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that's the that's the bottom line. And now you're not

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a particle physicist.

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But no, but doing what you do, check it out

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on the interweb and the answer seems to be yes. So,

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formed together from vacuum energy, these temporary particle anti particle

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pairs share linked to quantum properties like spin, and so

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they are entangled. And that does to raise the question,

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doesn't it that when one of them sucked into the

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black hole and the other one's not and it radiates outwards,

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well they become disentangled then, because they would be they

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wouldn't be in what's called a state of superposition, which

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is the quantum state where you know, things can be

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upside down in the right way up at the same time,

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and things of that sort. So yeah, I think they're

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probably entangled when they and look, I'm kind of making

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this up, but some particle physicists might want to correct me.

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But I think they're entangled when they're formed. I suspect

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across one of them crossing the event horizon becomes disentangled

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very quickly.

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Yeah, I guess. So we've got about ten thousand quantum

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physicists who listen to us, so one of them might

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give us an answer to that. And how does this

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differ from string theory? Is that nothing to do with

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quantum entanglement.

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So string theory, look, it's still conjectured, it's still not

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a theory that has any real evidence to support it.

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But that envisages pairs sorry particles as being like strings,

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as the name implies. So rather than a particle, what

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you've got is something with an additional dimension, and that

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the suggestion is that some of those dimensions are microscopic.

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They're wrapped up on the external surface of a string.

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I'm not sure what the interface between quantum sorry between

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string theory and quantum entanglement is, and it's an interesting

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thought that you've.

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Thrown in there, Andrew.

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I won't mind reading up a little bit more about that,

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because it's quite an interesting area. It used to do

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talks about string theory, most of which I've forgotten. But

283
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the thing about string theory is you do have to

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have additional dimensions other than the four that we know about,

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and a lot of theories postulate additional dimensions. If I

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remember right, list string theories had now, the numbers were ridiculous.

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I think some of them. Some of these theories needed

288
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twenty or more additional dimensions, and so it's yeah, it's

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hard to get your head around where all those dimensions

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might be lurking, but they're hidden dimensions, basically fascinating.

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Yeah, gosh, I think I opened a can of worms.

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You did, all right, But yeah, the bottom line for

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that question is yes, yes, they Yeah, the two quantum

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particles pop into existence at the same time, but we

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don't know what happens if one of them gets sucked in?

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Is it?

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I think that's the bottom line.

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You Yeah, Wow, fascinating, All right, Thanks Tony, Thanks for

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the question. Hopefull as well. In Marrickville. This is Space

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00:18:32.079 --> 00:18:38.160
Nuts with Andrew Dunkley and Professor Fred Watson. Let's take

301
00:18:38.160 --> 00:18:40.640
a break from the show to tell you about our sponsor,

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322
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your pace nuts. Okay, Fred, We'll go straight to our

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00:20:16.720 --> 00:20:19.640
next question. This one comes from.

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00:20:19.640 --> 00:20:23.319
Stuart's Good This is Stuart from Tasmania, home of the

325
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very cute little Tasmanian Devil.

326
00:20:26.000 --> 00:20:28.640
I just had a question about dark energy and how

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it's propelling the expansion of the universe. We know it's

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dark in the sense that it's mysterious, but I was

329
00:20:35.200 --> 00:20:38.759
also wondering about the use of the word energy considering

330
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the current theory says that having propelled the universe to expand,

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the level of dark energy does not decrease in our area,

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and the new area of space has just as much

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dark energy in it. I was just wondering how this

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would be possible given the current understanding of the laws

335
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of physics and the conservation of energy. Wondering if you

336
00:21:00.920 --> 00:21:03.200
could give us an update on the current thinking with

337
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regard to all this, and maybe I'm missing out on

338
00:21:05.799 --> 00:21:06.720
some new breakthroughs.

339
00:21:06.839 --> 00:21:11.400
Thank you, Thank you. Stuart loved Tasmania a beautiful place

340
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and I would balk at calling a Tasmanian devil cute.

341
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I have seen them devour a rabbit and they don't

342
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leave a thing. They eat absolutely everything, the bones, the fur,

343
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and everything in between. They are the perfect Nature's perfect

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garbage multa. Absolutely so, yeah, thanks for the info, Stuart Fred.

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00:21:44.880 --> 00:21:49.079
Yes, it's a great question, and there is new thinking

346
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on dark energy. It is counterintuitive that as you make

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more space, you make more energy, because you've got to

348
00:21:58.799 --> 00:22:03.880
come from somewhere. But all right, so what's the observation

349
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that leads to this idea. It's the fact that all

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the evidence points to an accelerated expansion of the universe,

351
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and that has been known since nineteen ninety eight. We

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have attributed that acceleration to this phenomenon of dark energy,

353
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which is I always think of it as a kind

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of springiness of space, and the bigger space gets the springery,

355
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it becomes springier it becomes and that's the sort of

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standard model of dark energy, which is put a term

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into some of Einstein's theories of relativity, which he called

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the cosmological constant, and it was a term that he

359
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invented in the mathematics to allow for the fact. In fact,

360
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he put it there because before when he was doing

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this work, he didn't know that the verse was expanding

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at all, and so he had to put this cosmological

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constant in to stop the universe expanding or contracting. He

364
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thought it was static, and then when in nineteen twenty

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nine Hubble discovered that the universe is expanding, he sort

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of regretted that, and he in a conversation I think

367
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with George Gamoff around I don't know, in the forties

368
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or fifties, he said it was the biggest blunder of

369
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his life, the cosmological constant. But when people realize that

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the expansion of the universe is actually accelerating, then the

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cosmological constant suddenly became one way of explaining that, or

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at least modeling it, modeling what was happening. If it's

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a cosmological constant that's doing this, then what you've got

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is an increase in energy that is proportional to the

375
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increase in space. So as the volume increases, you get

376
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a proportional amount of energy increase. That's because the energy

377
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per unit volume is constant. That's where the idea of

378
00:24:00.759 --> 00:24:02.759
asological constant comes from.

379
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So that.

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Has been the model until recently. Because we didn't have

381
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any observations to support anything else. But as you and

382
00:24:14.839 --> 00:24:19.119
I have spoken about, Andrew, the latest thinking, and it

383
00:24:19.160 --> 00:24:23.920
comes from the Dark Energy Survey, a major survey of

384
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the positions and velocities of galaxies that actually give you

385
00:24:27.799 --> 00:24:30.000
some idea of what's going on on the big picture

386
00:24:30.200 --> 00:24:34.599
side of the universe, looking back several billion years in

387
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our time wise direction as we look out into space,

388
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always looking back in time. So the latest thinking seems

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to suggest that the cosmological constant isn't constant because it

390
00:24:49.240 --> 00:24:54.440
looks as though the acceleration is actually slowing down or reducing.

391
00:24:55.440 --> 00:24:58.960
And that's led to conversations that you and I have

392
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had that maybe one day the acceleration would turn into

393
00:25:01.799 --> 00:25:05.559
a deceleration and then we might well return to the

394
00:25:05.559 --> 00:25:10.839
era of the Big Crunch or the ganab gibb. I'll

395
00:25:10.880 --> 00:25:13.119
put an aside in here, Andrew, just for your benefit.

396
00:25:14.519 --> 00:25:17.119
One of our I can't remember who it was, one

397
00:25:17.160 --> 00:25:20.519
of our listeners said, the gannab GiB sounds like one

398
00:25:20.559 --> 00:25:25.839
of the lost Beg Brothers. Yes, and I told you

399
00:25:26.519 --> 00:25:29.920
in the last episode that I was narrating some music

400
00:25:30.000 --> 00:25:32.400
in a couple of concerts down in Canberra over the

401
00:25:32.400 --> 00:25:35.880
weekend and I threw that one in and it went

402
00:25:35.920 --> 00:25:44.200
down an absolute treat, So, so thank you. Was it Martin? Yes,

403
00:25:44.240 --> 00:25:47.960
I had a feeling it was Martin, So Martin, thank

404
00:25:48.000 --> 00:25:48.359
you for that.

405
00:25:49.160 --> 00:25:51.079
You think of me? Were really gave you gave Fred

406
00:25:51.680 --> 00:25:56.079
a joke. He doesn't tell many jokes so well.

407
00:25:56.119 --> 00:25:58.720
Actually most of my talks are at one constant joke.

408
00:25:58.759 --> 00:26:02.119
I have to say, you've never heard one. You probably

409
00:26:02.160 --> 00:26:03.960
have actually a long time ago. But yeah, I do

410
00:26:04.279 --> 00:26:06.279
try and throw in as much lightness as I can

411
00:26:06.400 --> 00:26:10.039
and that hit the spot perfectly. So thank you Martin.

412
00:26:10.440 --> 00:26:14.119
I really enjoyed that. Right back to the story, So

413
00:26:14.200 --> 00:26:17.200
there won't be a gonna GiB a big crunch unless

414
00:26:17.240 --> 00:26:21.200
the acceleration really turns into a deceleration, and that would

415
00:26:21.480 --> 00:26:25.799
modify how we understand Just coming back to Stewart's question,

416
00:26:25.920 --> 00:26:30.400
how we understand that? You know the energy constant of

417
00:26:30.480 --> 00:26:35.960
the universe, and I think it leads you to the

418
00:26:36.079 --> 00:26:39.000
sort of thing we were just talking about higher dimensions

419
00:26:39.039 --> 00:26:42.920
and new physics, physics we don't understand. I think if

420
00:26:42.960 --> 00:26:48.440
the decelerating, sorry the decreasing acceleration of the universe is

421
00:26:48.480 --> 00:26:51.599
going to be properly explained, we may well have to

422
00:26:51.680 --> 00:26:56.640
invoke new physics that currently are unknown. So this is

423
00:26:56.640 --> 00:27:00.640
cutting edge stuff. It's very exciting and we'll just see

424
00:27:00.640 --> 00:27:02.759
where it goes and you'll probably hear about it on

425
00:27:02.799 --> 00:27:03.759
Space Nuts, Stuart.

426
00:27:04.279 --> 00:27:09.559
Yes, it's such a big area to try and understand,

427
00:27:09.599 --> 00:27:13.200
and there's I think we're really only at the dawn

428
00:27:13.279 --> 00:27:18.799
of the process of unraveling what dark energy is all about.

429
00:27:18.960 --> 00:27:23.480
And we've said before it's poorly named. It's probably it's

430
00:27:23.519 --> 00:27:26.400
creating so much confusion with dark matter, which is also

431
00:27:26.559 --> 00:27:30.680
probably poorly named. But anyway, Stewart might be interested to

432
00:27:30.799 --> 00:27:35.119
go to the Dark Energy Survey dot org website if

433
00:27:35.200 --> 00:27:37.240
he wants to find out more, because there's plenty of

434
00:27:37.240 --> 00:27:40.880
information there and they're updating what they're learning or studying

435
00:27:41.519 --> 00:27:45.799
all the time. So yeah, dark energy survey dot org

436
00:27:46.799 --> 00:27:49.400
could be a good port of call for you. Stuart,

437
00:27:50.640 --> 00:27:53.160
and I have fun down there with your Tasmanian Devils

438
00:27:53.359 --> 00:27:56.960
when Judy and I went to Tasmania on our honeymoon,

439
00:27:57.000 --> 00:27:59.039
believe it or not, she never let me forget it,

440
00:28:00.079 --> 00:28:03.279
and one of the most common roadkills we saw at

441
00:28:03.319 --> 00:28:07.319
Tasmanian Devils, which is very sad, but yeah, there were

442
00:28:07.559 --> 00:28:09.160
quite a few of them lying on the sides of

443
00:28:09.160 --> 00:28:13.799
the roads, which is I guess you know it's unique

444
00:28:13.799 --> 00:28:19.799
to Tasmania. Here it's kangaroos and more kangaroos. Okay, thanks Stuet.

445
00:28:19.880 --> 00:28:22.799
We'll go on to our final question. Hello, space nuts.

446
00:28:22.839 --> 00:28:26.400
This is Thomas from Virginia. So this is a what

447
00:28:26.480 --> 00:28:29.519
if question? Fred, I love what if questions. So if

448
00:28:29.519 --> 00:28:33.119
you had a way to push Earth to another star's

449
00:28:33.319 --> 00:28:37.200
Goldilocks zone when our Sun starts to die, what would

450
00:28:37.319 --> 00:28:40.920
happen to the atmosphere on the way. I assume it

451
00:28:40.960 --> 00:28:44.640
would freeze, but then what would happen to it after that?

452
00:28:45.279 --> 00:28:48.319
So yeah, that comes from Thomas. It reminds me of

453
00:28:48.359 --> 00:28:52.039
a movie I watched, and I must confess I didn't

454
00:28:52.079 --> 00:28:55.119
finish it. It just got too much for me. I

455
00:28:55.160 --> 00:28:58.240
love science fiction, but this one just threw me over

456
00:28:58.279 --> 00:29:00.680
the edge. It was I can't remember the title of it,

457
00:29:01.400 --> 00:29:04.759
but Earth had to move because there was an issue,

458
00:29:04.799 --> 00:29:07.519
probably with the Sun, and they wanted to move out

459
00:29:07.559 --> 00:29:10.880
to Jupiter and so they attached all these giant rockets

460
00:29:10.880 --> 00:29:15.200
to Earth and it just got grazier from there. But

461
00:29:15.319 --> 00:29:18.400
let's say he could what would happen to our atmosphere.

462
00:29:21.960 --> 00:29:26.880
It's a great question because there are you know, when

463
00:29:26.920 --> 00:29:31.680
you think of gas giants, they've got atmospheres that are

464
00:29:31.720 --> 00:29:38.559
still gaseous well outside the Goldilock zone, possibly partly because

465
00:29:39.119 --> 00:29:42.680
those bodies are radiating heat themselves, as is the Earth

466
00:29:42.720 --> 00:29:46.200
at a very low level. The Earth has some low

467
00:29:46.279 --> 00:29:50.480
level nuclear reactions going on in its nucleus in the center,

468
00:29:51.480 --> 00:29:53.640
the core of the Earth, and so there is a

469
00:29:53.720 --> 00:29:56.680
little bit of heat comes from the Earth itself that

470
00:29:56.839 --> 00:30:03.680
might stop it freezing. So I'm sort of drawing. The

471
00:30:03.720 --> 00:30:06.480
parallel that I would draw in my head is with

472
00:30:07.880 --> 00:30:12.519
the dwarf planet Pluto, which does have an atmosphere. It's

473
00:30:13.160 --> 00:30:18.799
very very thin, but a lot of the kind of

474
00:30:18.839 --> 00:30:23.680
atmosphere constituents of the Earth are actually frozen at the

475
00:30:24.119 --> 00:30:28.319
distance of Pluto. So I think, what is it minus

476
00:30:28.359 --> 00:30:32.640
two hundred and thirty or thereabouts the temperature that Pluto

477
00:30:32.880 --> 00:30:37.839
on the surface, and the nitrogen is frozen because you've

478
00:30:37.839 --> 00:30:44.480
got nitrogen glaciers there sort of slushy slushy nitrogen flowing around.

479
00:30:45.759 --> 00:30:49.160
So I suspect that might happen to the Earth's atmosphere,

480
00:30:49.200 --> 00:30:52.880
but there would be a residual level of air, I think,

481
00:30:53.480 --> 00:30:56.319
but when you got back to your Goldilocks zone in

482
00:30:56.359 --> 00:30:59.480
another solar system, hopefully it would all just come good again.

483
00:31:00.480 --> 00:31:03.039
And you know, your nitrogen starts to be a gas

484
00:31:03.119 --> 00:31:08.599
rather than a rather than a solid, and you could

485
00:31:09.359 --> 00:31:13.880
with there might be some loss of components of the atmosphere,

486
00:31:13.880 --> 00:31:16.319
but generally I think what you might have is something

487
00:31:16.759 --> 00:31:19.799
much the same as you set off with. That's my guess.

488
00:31:19.839 --> 00:31:22.599
Anyway. I don't think we have to take a sep

489
00:31:22.680 --> 00:31:26.880
farther if you know, when the Sun expands and we

490
00:31:27.039 --> 00:31:28.359
just have to move out a little bit.

491
00:31:29.359 --> 00:31:33.279
But I think that's right, you know. But the problem is,

492
00:31:33.480 --> 00:31:37.400
as you said, it's just science fiction to think of

493
00:31:37.480 --> 00:31:40.559
moving a planet. We don't have any way of doing

494
00:31:40.640 --> 00:31:43.680
that at the moment, other than the only other way

495
00:31:43.799 --> 00:31:45.759
to do it will be to hit it with another planet,

496
00:31:45.799 --> 00:31:47.319
But that brings its own concerns.

497
00:31:47.400 --> 00:31:53.079
That would work, as we spoke about in the last episode.

498
00:31:53.160 --> 00:31:56.200
Although yeah, indeed that's right, it did.

499
00:31:55.799 --> 00:31:59.599
Wouldn't be a good effect. Maybe we could employee string

500
00:31:59.680 --> 00:32:02.200
theory and drag ourselves out there.

501
00:32:03.799 --> 00:32:06.519
Who knows, well, if this extra hidden dimensions, we might

502
00:32:06.559 --> 00:32:08.000
be able to pop the Earth into one of them

503
00:32:08.000 --> 00:32:09.160
and come out somewhere else.

504
00:32:09.759 --> 00:32:11.799
I think if you did find a way to move

505
00:32:11.839 --> 00:32:14.720
Earth to a better place when required, you'd have to

506
00:32:14.759 --> 00:32:19.480
put people somewhere else. In the meantime, you'd probably survived

507
00:32:19.480 --> 00:32:25.279
the journey on the planet gep It tough, but yeah,

508
00:32:25.400 --> 00:32:29.279
interesting question, Thomas. But yes this South Koreans did make

509
00:32:29.279 --> 00:32:32.000
a movie about this very concept if you want to

510
00:32:32.000 --> 00:32:34.960
look it up. I can't remember the name. I don't

511
00:32:34.960 --> 00:32:39.160
want to. I didn't really enjoy it. It was a weird,

512
00:32:39.400 --> 00:32:42.519
weird film. But they do make weird movies in South Korea,

513
00:32:42.599 --> 00:32:45.839
so it's right up there. They love their science fiction though.

514
00:32:47.039 --> 00:32:49.359
Thanks Thomas. Great to hear from you, And if you

515
00:32:49.519 --> 00:32:52.319
have questions for us, please please please go to our

516
00:32:52.319 --> 00:32:55.400
website and click on the Ask Me Anything tab at

517
00:32:55.440 --> 00:32:59.119
the top where you can send us text and audio questions.

518
00:32:59.440 --> 00:33:02.559
We still struggling to get audio questions. People don't want

519
00:33:02.559 --> 00:33:03.920
to talk to us, fred I think that's what it

520
00:33:03.960 --> 00:33:08.559
comes down to. Podcast dot com at space That's dot

521
00:33:08.599 --> 00:33:11.599
io are the two r ls that will work. Man.

522
00:33:11.640 --> 00:33:15.440
While you're there, have a look around, and please leave

523
00:33:15.480 --> 00:33:20.559
reviews on your favorite podcasting platform. The more reviews, the better.

524
00:33:20.640 --> 00:33:25.240
Apparently unless they're you know, one star is. Don't really

525
00:33:25.359 --> 00:33:27.680
like those, but you know you get the occasional one.

526
00:33:27.720 --> 00:33:31.079
I suppose there it is. Fred, thanks so much, great

527
00:33:31.079 --> 00:33:33.079
to catch up it is.

528
00:33:33.519 --> 00:33:36.079
Thank you for hubbing me, and sorry about all the

529
00:33:36.079 --> 00:33:37.119
glitches earlier on.

530
00:33:37.759 --> 00:33:40.839
It's All Good. It's all good. Professor Fred Watson, Astronomer

531
00:33:40.880 --> 00:33:43.319
at Large. We'll catch him on the next episode. And

532
00:33:43.559 --> 00:33:45.960
thanks to Hugh in the studio who couldn't be with

533
00:33:46.039 --> 00:33:48.759
us today because they called him out to fix the internet,

534
00:33:49.359 --> 00:33:51.880
so he'll be back in about three hundred years. And

535
00:33:51.960 --> 00:33:54.319
from me Andrew Dunkley, thanks for your company. We'll see

536
00:33:54.319 --> 00:33:56.720
you on the next episode of Space Nuts. Bye bye

537
00:33:59.079 --> 00:34:06.319
to the Space Nuts podcast. Available at Apple Podcasts, Spotify, iHeartRadio,

538
00:34:06.680 --> 00:34:09.719
or your favorite podcast player. You can also stream on

539
00:34:09.800 --> 00:34:13.239
demand at bites dot com. This has been another quality

540
00:34:13.320 --> 00:34:17.639
podcast production from nights dot Com.