Feb. 27, 2025
Asteroids, Alien Signals & Icy Moons: #499 - Unpacking the Latest in Cosmic Discoveries
Space Nuts Episode 499: Asteroid Updates, Life in the Cosmos, and SpaceX Mishaps
Join Andrew Dunkley and Professor Jonti Horner in this exciting episode of Space Nuts, where they delve into the latest developments in asteroid research, the ongoing...
Space Nuts Episode 499: Asteroid Updates, Life in the Cosmos, and SpaceX Mishaps
Join Andrew Dunkley and Professor Jonti Horner in this exciting episode of Space Nuts, where they delve into the latest developments in asteroid research, the ongoing quest for extraterrestrial life, and some recent SpaceX controversies. From the fate of asteroid 2024 YR4 to the intriguing possibilities of subsurface oceans on icy moons, this episode is packed with information that will keep you on the edge of your seat.
Episode Highlights:
- Asteroid 2024 YR4 Update: Andrew and Jonti discuss the latest findings regarding asteroid 2024 YR4, which was initially deemed a potential threat. They clarify the current low probability of impact and explore the implications for both Earth and the Moon, including what would happen if it were to collide with the lunar surface.
- Are We Alone in the Universe? The duo tackles the age-old question of extraterrestrial life, discussing new data and the challenges scientists face in searching for evidence of life beyond Earth. They consider the likelihood of finding simple versus complex life forms in the cosmos and the significance of ongoing missions aimed at detecting signs of life within our solar system.
- SpaceX's Recent Challenges: The conversation shifts to SpaceX, where Andrew and Jonti analyze the recent mishaps involving their rockets, including uncontrolled reentries and debris falling over populated areas. They discuss the implications of these events for space safety and the future of space exploration.
- Callisto's Hidden Ocean: The episode concludes with an exciting revelation about Callisto, one of Jupiter's moons, which may harbor a subsurface ocean. Jonti explains how new analysis techniques have strengthened the case for liquid water beneath its icy surface, further expanding the possibilities for life in our solar system.
For more Space Nuts, including our continually updating newsfeed and to listen to all our episodes, visit our website. Follow us on social media at SpaceNutsPod on Facebook, X, YouTube Music Music, Tumblr, Instagram, and TikTok. We love engaging with our community, so be sure to drop us a message or comment on your favorite platform.
If you'd like to help support Space Nuts and join our growing family of insiders for commercial-free episodes and more, visit spacenutspodcast.com/about
Stay curious, keep looking up, and join us next time for more stellar insights and cosmic wonders. Until then, clear skies and happy stargazing.
00:00 - Introduction and asteroid update
02:15 - Current status of asteroid 2024 YR4
10:30 - Discussion on extraterrestrial life
18:00 - SpaceX mishaps and debris concerns
26:45 - Callisto's potential subsurface ocean
30:00 - Closing thoughts and listener engagement
✍️ Episode References
Asteroid Impact Probability Analysis
https://www.nasa.gov/asteroid-impact
SETI Research and Extraterrestrial Life
https://www.seti.org/
Callisto's Subsurface Ocean Study
https://www.universetoday.com/callisto-ocean
Become a supporter of this podcast: https://www.spreaker.com/podcast/space-nuts-exploring-the-cosmos--2631155/support.
Join Andrew Dunkley and Professor Jonti Horner in this exciting episode of Space Nuts, where they delve into the latest developments in asteroid research, the ongoing quest for extraterrestrial life, and some recent SpaceX controversies. From the fate of asteroid 2024 YR4 to the intriguing possibilities of subsurface oceans on icy moons, this episode is packed with information that will keep you on the edge of your seat.
Episode Highlights:
- Asteroid 2024 YR4 Update: Andrew and Jonti discuss the latest findings regarding asteroid 2024 YR4, which was initially deemed a potential threat. They clarify the current low probability of impact and explore the implications for both Earth and the Moon, including what would happen if it were to collide with the lunar surface.
- Are We Alone in the Universe? The duo tackles the age-old question of extraterrestrial life, discussing new data and the challenges scientists face in searching for evidence of life beyond Earth. They consider the likelihood of finding simple versus complex life forms in the cosmos and the significance of ongoing missions aimed at detecting signs of life within our solar system.
- SpaceX's Recent Challenges: The conversation shifts to SpaceX, where Andrew and Jonti analyze the recent mishaps involving their rockets, including uncontrolled reentries and debris falling over populated areas. They discuss the implications of these events for space safety and the future of space exploration.
- Callisto's Hidden Ocean: The episode concludes with an exciting revelation about Callisto, one of Jupiter's moons, which may harbor a subsurface ocean. Jonti explains how new analysis techniques have strengthened the case for liquid water beneath its icy surface, further expanding the possibilities for life in our solar system.
For more Space Nuts, including our continually updating newsfeed and to listen to all our episodes, visit our website. Follow us on social media at SpaceNutsPod on Facebook, X, YouTube Music Music, Tumblr, Instagram, and TikTok. We love engaging with our community, so be sure to drop us a message or comment on your favorite platform.
If you'd like to help support Space Nuts and join our growing family of insiders for commercial-free episodes and more, visit spacenutspodcast.com/about
Stay curious, keep looking up, and join us next time for more stellar insights and cosmic wonders. Until then, clear skies and happy stargazing.
00:00 - Introduction and asteroid update
02:15 - Current status of asteroid 2024 YR4
10:30 - Discussion on extraterrestrial life
18:00 - SpaceX mishaps and debris concerns
26:45 - Callisto's potential subsurface ocean
30:00 - Closing thoughts and listener engagement
✍️ Episode References
Asteroid Impact Probability Analysis
https://www.nasa.gov/asteroid-impact
SETI Research and Extraterrestrial Life
https://www.seti.org/
Callisto's Subsurface Ocean Study
https://www.universetoday.com/callisto-ocean
Become a supporter of this podcast: https://www.spreaker.com/podcast/space-nuts-exploring-the-cosmos--2631155/support.
WEBVTT
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By there.
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Welcome to another episode of Space Nats. I'm your host
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Andrew Dunkley. As always, it is great to have your company.
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Hope you're well, and I hope you can stay with
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us because we are going to give you yet another
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asteroid update. Yes, it's still in the news. I was
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reading stories online over the weekend and no, it's all
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doom and gloom twenty twenty four y r four. It's
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going to kill us all. Well, let's find out the truth.
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We're also going to answer a question. It's not the
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definitive answer, but it's the answer. At this point in time,
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are we alone? And the reason new data that's been
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released SpaceX has got itself into the news again for
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all the wrong reasons. And there might be another moon
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in our solar system that harbors a liquid ocean.
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We'll tell you which one it is. On this episode of.
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Space Nuts Channel ten nine.
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Ignition, Space Nuts three two one, Space.
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Nurse and I record it Nels good and he is
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back for more. It is Johnny Horner, professor of astrophysics
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at the University of Southern Queensland.
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Johnny, Hello, good afternoon, how are you going.
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I am well, good to see you and Johnny warned
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me that we might hear some dog interruption, not from
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the dog star but from the dog dogs. Yes, when
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the other half turns up, because they get very excited that.
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We've been really excited at people walking down the road.
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So well, yeah, that's maybe you can hear them. Maybe
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you come, but I'm hearing.
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The filters might be stopping it from getting through to
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the recording. Sometimes that happens. But yeah, well we've heard
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Jordie many many times on the podcast at at friend's house,
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so yes, not unusual, and we don't mind. We've been
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interrupted by all sorts of creatures on this show over
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the years. Let's start off with yet another update on
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our favorite asteroid might not be our favorite. If you
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read the Popular Prayers twenty twenty four four.
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What's the latest, Well, the latest, long and short is
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that catastrophe is averted. It is almost certainly not going
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to hit it. And this has come around a little
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bit quicker than I was expecting, actually, but I've seen
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some beautiful visualizations released by both European Space Agency and
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NASA over the last few days that have shown what's
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going on. So I mentioned on the previous episodes that
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we found this object back on the twenty seventh of December.
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They immediately found some old images that went back to
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the twenty fifth of December when it was closest to
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the Earth, and people have been observing it pretty full
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on ever since. Those that could do, because it's quite small,
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quite fent. As it receded from the Earth and end
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of January, the odds of it hitting the Earth got
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high enough in twenty thirty two, in eight years time,
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that it was flagged up as been potentially threatening and
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it got the second highest ever rating on the Plurmar scale.
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So basically, this thing is something to watch out for.
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We're not saying it's going to hit the Earth, but
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we need more data. As time's gone on since then,
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we've got more and more data, and for a while,
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the probability of hitting us on that day, on the
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twenty second of December twenty thirty two was increasing, and
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that was exactly what you'd expect. So you get more observations,
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which means our knowledge of where it will be on
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that fateful day gets better, so the area of uncertainty
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on where it will be get smaller, so you're shrinking
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the volume of space where the asteroid could be and
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if the Earth stays in that area, the Earth becomes
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a bigger fraction of that total area, so it's more
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likely to be hit.
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Yep.
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And what I said at the time was eventually we'd
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get enough observations that the Earth could potentially fall outside
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that area, so the area would shrink enough that the
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Earth kind of popped out of it, fell out onto
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the other side. And that's what's happened over the last
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few days. Now the Earth is not totally and absolutely
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out of the firing line, but it's almost as good
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as and I'm sure within a day or two it
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will drop to absolutely zero. So as of the time
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where recording this, which is February the twenty fifth, the
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latest probability of an impact is two point seven times
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ten to the minus five, which means no point not
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two seven percent, or one in thirty seven thousand. Now,
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given the last week we were talking about one in
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thirty three, that's a very dramatic change. And that's big. See,
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area that the object is going to be in has
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shrunk and shrunk and shrunk, and the Earth is essentially
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popped out of the outside. And that's what these beautiful
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visualizations that are popping up online are showing an interesting
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part of this so is that while Earth is out
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of the cross heads, the Moon is still in the crosshairs.
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So there remains a possibility that this thing could hit
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the Moon, but the probability of an impact on the
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Moon is still pretty low. So it isn't a case
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of we're saying the Earth is spared. Watch out anybody
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who's part of Project Tartemis, you know, walking around on
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the Moon in eight years time, if that happens. Rather,
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it's just that the Moon still hasn't fallen out of
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that area yet, but bad anticipate it probably will do.
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So the most likely outcome is that this thing will
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come close, but it's not going to be that close.
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Okay, Now, what if it did hit the Moon, what
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would be the effect. Would it just make a mighty
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big crater? It'd make not even that mighty, not even
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that big.
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A good rule of thumb on the Earth is that
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if something solid makes it to the surface of the Earth,
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the creater that thing will create is going to be
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to first order, nineteen times bigger than the impact. Little
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bit of wiggle room in there obviously a different material
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for the impact would have an impact. A different speed
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would have an impact, But first order, it's about a
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rule of nineteen. I think that changes slightly from body
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to body, but not hugely, because it's still the physics
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of rock hitting rock or metal hitting rock. What that
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means is, if this thing is the size of the
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best estiments, which is about fifty five meters, then you're
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looking at about a one kilometer crater, which I mean
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is substantial. It's big enough for us to observe, but
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it's nowhere near the biggest anywhere out there. It's probably
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not big enough that a substantial amount of material will
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be ejected from the Moon to reach us. But people
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have tried to fearmonger that a little bit. I've seen
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a few posts from people online saying if it hits
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the Moon, the Earth will get hit by a load
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of debris. Realistically, not much debris would reach the Earth,
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so we might get a little bit burning up in
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the atmosphere, but we wouldn't even probably notice, because it
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seems fairly small. I've seen some studies arguing that you
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need an impact or at least a kilometer across to
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eject enough material from the Moon for us to rarely
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pick it up and notice it from the point of
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view of looking up.
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Okay, all right, well we've got how long to wait?
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Just other great years, so we can revisit this in
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the future when Fred is once again looking at Aurora
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in Scandinavia.
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Why not? All right?
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So the good news is the odds have plummeted, and
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despite what I read in I don't know how many
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news outlets on Sunday, the story is very very different today.
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Yeah, it's a very fast moving story. And if you
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can find these little animations online, they're worth looking at
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because it shows you a line that is basically all
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the possible places the astro coup, and it's that's the
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result of lots of simulations with slightly different initial conditions
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that all much within our uncertainty where the object is currently,
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and you get this long stretch outline. And then with
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every day of new observations, that line gets shorter and
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shorter and shorter, and now the Earth is right on
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the very end of it, barely touched by any of them.
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And I'm sure tomorrow the earthwallpers scott free.
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Okay, that's good news, very good news.
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Space nuts.
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Now to a question that we do get from time
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to time from our audience asking about whether or not
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we are alone in the universe. I suppose that is
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one of the big questions yet to be answered as
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far as the wider well humanity is concerned. That question
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has got new data attached to it, which is very
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interesting because of the way it's been collected. And the
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downside is the result at this point in time, at
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this point in time, But yes, are.
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We alone so far? I think that's the best answerment
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it is.
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So there are two different ways that we'll look to
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answer this question, and two different things we're looking for.
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One is just to look for any evidence of any
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kind of life, and we're doing that within the Solar system,
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and we're doing outside of the Solar system by looking
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for subtle indications that there could be life in various
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places and will probably amount to finding something that's out
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of equilibrium that shouldn't be there. A good example being
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the phosphene observations on Venus a few years ago that
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reads a lot of excitement but are probably not actually
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a life, but we don't know. It's finding something out
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of place and inferring that life is the best explanation
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that could exist for it, and that's where we're going
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to be doing a lot of work in the coming
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decade or two looking at planets around the starts. That
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is a search for any life, particularly simple life, and
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I think, you know, as a little bit of an aside,
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I think we're more likely to find simple life before
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we find complex life, just because of the amount of
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available real estate and the amount of available time. So
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if you look back at the history of the Earth,
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it seems to be accepted that we've had life on
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Earth for at least three and a half thousand million
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years old. Its fossils are found in the Pilburg in
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Western Australia. That's really kind of cool. We've only had
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complex life on Earth for about five hundred million years,
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so I think there are some studies this week I
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saw that suggest it might have been around a bit
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longer than that. So what that means is if you
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could do something really bizarre and make a dice with
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seven sides, which I've had somebody tell me is almost
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impossible to do, but you know, get a seven sided
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die instead of a six sided die and roll that die.
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You're looking at the Earth at some point in that
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three and a half billion year period, and only if
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you roll a seven would you see the Earth when
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there was complex life. So six times out of seven
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yard hitters when there's simple life. The other side of
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it is if you look at the habitats that life
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occupies on Earth, you know there are a far, far,
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far far greater amount of habitats where simple life can
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thrive than where complex life can thrive. You know, if
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I took you up to forty thousand feet and let go,
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you wouldn't so much fly as plummet in the immortal
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words munty python, but we find bacteria up there. If
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I drop you in, you know, one of the superheated
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lakes in Yellowstone, you'd dissolve quicker than people could pull
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you out, and that would be pleasant. But we find
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bacteria there. So there are far there's a far wider
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envelope of environments where you could find simple life than
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where you'd find complex life. All of that is based
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on the caveat that we're looking at life like Earth
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life of God, and that's a very big caveat. Is
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an assumption that is implicit in what most people discuss,
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and I think it's important to make it explicit. You
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watch Star Trek and you imagine multen metal men wandering
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around on magma planets and things like this, and intelligent
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hydrogen clouds. But when we're looking for things like life,
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it makes more sense to look for something we know
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can exist than for something that we could speculate might exist.
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And so we know of Earth life, so that forms
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our first template, and that will inform our first search.
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Even though you'd admit that there could be other kinds
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of life out there, and with Earth life as a template,
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you'd argue that for most of the time there's been
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life on Earth, we only have simple life. And in
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most of the places and environments you can find life
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on Earth, you can only find simple life. So that
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suggests to me simple life will be more common than
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complex life and the cosmos, and we're more likely to
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find that. Of course, that Zafemer saying that the only
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prediction you can make that is accurate is that all
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predictions will be wrong. So when we do find life,
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please don't shout at me. But that's kind of where
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I take it. But the coming back to the story,
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after I get derailed and go on a diversion, this
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story is looking at the other way, we can search
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for life, which is the one that has the potential
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for greater reward and greater excitement, but a lower potential
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