Sept. 15, 2026
Lunar Mysteries and Snowball Earth: Unraveling Cosmic Enigmas
SpaceTime Series 29 Episode 110 Lunar far side rocks rewriting history A new study claims the timing and intensity of asteroid bombardment across the lunar surface declined gradually, rather than being a short, intense burst of impacts as previously thought. The crystals that might have made Snow Ball Earth worse A new study claims planet Earth may have been pushed deeper into a global deep freeze known as snowball Earth by something as ordinary as salt. Meteor strike reported off the Western Australian coast The European Space Agency’s Near Earth Objects co-ordination centre has reported a meteor impact in the Indian Ocean off the coast of north western Australia. The Science Report Warnings of a ten percent chase that AI could cause human extinction within the next decade. The world enters a new era of artificial general intelligence with the release of GPT-6 Astra. A new study has shown that Psychiatrists agree on a diagnosis in only 55% of cases. The 2026 Ig Nobels handed out in Switzerland showing what happens to old undies. Skeptics guide to the truth about surveys.
Our Guests This Week Dr Fred Jourdan from Curtin University ESA BepiColombo Project Scientist Johannes Benkhoff DLR Planetary Scientist Jorn Helbert Our regular guests: Alex Zaharov-Reutt from techadvice.life Tim Mendham from Australian Skeptics 🌏 Get Our Exclusive NordVPN deal here ➼ www.bitesz.com/nordvpn . The discounts and bonuses are incredible! And it’s risk-free with Nord’s 30-day money-back guarantee! ✌ If you’d like to support the podcast and gain access to bonus content by becoming a SpaceTime crew member, you can do just that through The Big Bang editions on Patreon, Spotify and Apple Podcasts. Details on the Support page on our website https://www.bitesz.com/show/spacetime/support/ For more SpaceTime and show links: https://linktr.ee/biteszHQ If you love this podcast, please get someone else to listen too. Thank you…
Our Guests This Week Dr Fred Jourdan from Curtin University ESA BepiColombo Project Scientist Johannes Benkhoff DLR Planetary Scientist Jorn Helbert Our regular guests: Alex Zaharov-Reutt from techadvice.life Tim Mendham from Australian Skeptics 🌏 Get Our Exclusive NordVPN deal here ➼ www.bitesz.com/nordvpn . The discounts and bonuses are incredible! And it’s risk-free with Nord’s 30-day money-back guarantee! ✌ If you’d like to support the podcast and gain access to bonus content by becoming a SpaceTime crew member, you can do just that through The Big Bang editions on Patreon, Spotify and Apple Podcasts. Details on the Support page on our website https://www.bitesz.com/show/spacetime/support/ For more SpaceTime and show links: https://linktr.ee/biteszHQ If you love this podcast, please get someone else to listen too. Thank you…
The Astronomy, Space, Technology & Science News Podcast.
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This is Space Time, Series 29, Episode 110, full broadcast
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on the 14th of September, 2026. Coming up on Space Time,
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the lunar far side rocks which are rewriting history, the
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crystals that may have made snowball Earth even worse, and
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a meteor strike reported off the Western Australian coast. All
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that and more coming up on Space Time.
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Welcome to Space Time.
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With Stuart Gary. Music A new study claims that the
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timing and intensity of asteroid bombardment across the lunar surface
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actually declined rather gradually, rather than being a short intense
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burst of impacts which stopped abruptly as previously thought. The
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discovery reported in the journal Science Advances, based on samples
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of regolith brought back from the far side of the
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moon by China's Chang'e 6 mission in June 2024. These
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findings are helping astronomers uncover how asteroid impacts helped shape
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the early solar system. And they challenged decades of thinking
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about when those impacts occurred, in the process offering new
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insights into the conditions which influenced Earth's evolution. Unlike Earth,
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where ancient geological evidence has been largely erased by erosion,
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volcanic activity and shifting tectonic plates, the Moon has preserved
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a record of impacts stretching back billions of years. One
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of the study's authors, Fred Jourdan from Curtin University, says
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the lunar samples brought back by Chang'e 6 act as
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a sort of natural archive of the solar system's history,
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allowing scientists to investigate events that occurred shortly after the
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planets formed 4.6 billion years ago. And the samples collected
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from the lunar far side are especially significant. That's because
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they allow scientists to compare two very different parts of
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the moon at the same time. See, until now, almost
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everything we know about the moon came from the lunar nearside,
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the one facing the Earth. Jourdan says by analysing these
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ancient lunar rocks from both the near and far side,
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scientists can better understand when major asteroid impacts occurred and
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how the early solar system evolved. He says the far
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side preserves a cleaner record of these earliest impacts because
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it was much less affected by later geological events compared
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to the near side of the moon, the side facing
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the Earth. Therefore, he says, these samples are helping to
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rewrite parts of the moon's history, and they suggest that
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the early solar system experienced a long, slow decline in
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asteroid impacts rather than a single catastrophic late heavy bombardment.
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The authors reached their conclusions by analysing tiny fragments of
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lunar regolith, revealing impact events spanning about 4.33 to 1.13
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billion years ago, allowing them to reconstruct more than 3
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billion years of lunar impact history. Jourdan says understanding the
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moon's impact history will also provide important clues about the
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Earth's own past. That's because the moon and Earth share
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a common history. They're both in the same part of
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the solar system, and therefore experience the same sort of environment.
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But the evidence of early impacts has been largely erased
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from the Earth. He says because the Moon and Earth
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formed together, every major impact recorded on the Moon tells
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us something about the sorts of conditions experienced by the
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young Earth as well.
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They were obviously a fantastic opportunity to get some data
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on a place we'd never been before. Because, of course,
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Apollo went to the near side of the Moon. and
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went a couple of times, and we had 50 years
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to study those rocks. We learned so much from them,
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and we keep learning some new stuff. But now this
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is a different game. This is the far side, and
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we've never been there. So the Chinese, they decided to
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be the first one to explore this side of the
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moon and collect some rocks, and they were successful, which
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is amazing considering that you can't talk to any spacecraft
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that goes beyond the moon. That's why the Americans never
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send anything. But they send a satellite that could communicate
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so they could make this mission successful. So two years ago,
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they sent their spacecraft, landed, grabbed some soil, did a
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bit of drilling, not too deep, very shallow, a few
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tenths of centimeter, collect those rocks. and bring them back
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to Earth. So two kilos of rocks from a part
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we never studied before. So everybody was really excited about that.
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What our study did is to look at rocks that
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were impacted because on the near side, the rocks that
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are impacted tell a really interesting story and also an
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hypothesis that looks really fantastic. The late heavy bombardment. So
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what that means is that the near side of the
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moon record a period or seems to record a period
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where bombardment intensified. So a lot of asteroid struck in
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a very narrow period of time. So some people thought like, well,
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maybe Jupiter moved and pushed some asteroid and intensified the bombardment.
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A lot of hypotheses, a lot of ideas. And quite frankly,
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that would be absolutely amazing. But we have just a
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tiny area of the moon where the Apollo mission landed.
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That's all.
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So If I want to do an analogy, it's like
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you want to know the geology of Australia, but you
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just land in Perth and you study there. So if
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you do that, you're going to miss that we had
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recent mechanism in Melbourne or the Great Reef Barrier now,
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things like that. So you want to go to a
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place we've never been before. So that's what they did.
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So we analyzed... that have been impacted as well, but
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from a different place this time. And we look if
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we see a similar story of this late heavy bombardment
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or if we see something different. Actually, we saw something
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really different. We didn't see any late-evite bombardment signature, no
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spike at all. And that's why this story is fascinating,
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because it tells something else.
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What are the sort of signatures you were looking for?
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So we look at those tiny rocks and we date them.
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So we look at their age. Each impact, it's going
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to melt the rock that it impacts of a large area.
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And it's going to reset the chronometer in this rock.
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So we use argon-argon dating. So it's the decay of
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potassium in argon. It's a naturally occurring process. And we
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use that to measure the age of the rock. So
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we analyze 28 small pieces of melt rocks. And each
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of them give a different ages. And they were really,
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really good ages. But we didn't see any age concentration
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around 3.9. And even better, we saw older age than 3.9.
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So the older we got was 4.33 billion. And in
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terms of impact basin that we dated on March, The
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near side, we didn't see age that old. So we
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saw a completely different story that seems to say that
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there's no late heavy bombardment on the moon. But one
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side said there's a late heavy bombardment. The other one
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says not. We have a contradiction because the bombardment should
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be the same everywhere.
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When you look at the moon, there is a dichotomy
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there in the way it looks on the surface.
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Yes, but people tend to mistake those dark patches. They
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are not the impact basin. They are the lava flow
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that fills the impact basin. So impact basin is just
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a very large impact crater on the moon. And the
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impact basin on the far side and on the near side,
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it's about the same number. In fact, there's a tiny
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bit difference. bigger one on the far side. So in
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terms of impact basin, yeah, the moon is homogenous. So
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both sides record the same thing as they should. If anything,
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the near side should be maybe protected a bit by
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the Earth, which should act like a shield. So it
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shouldn't be more impacted than the far side. So both
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should record the same thing. People tend to think like, oh, look,
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there's more crater on the near side. It's just because
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they are filled by this dark lava, so they stand
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out more. But that's exactly the same from both sides.
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That's because both the near and far side appear to
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have different geologies below the surface.
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Yeah, absolutely. It's the thickness of the crust, the fact
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that the moon is tidally locked looking at the Earth
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from the near side. All that influences the volcanism. But
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in terms of impact, impact, it's a very random process.
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So it should be really the same on both sides.
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But like I said, the two studies or series of
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studies show kind of different answers. So what gives? Actually,
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I would argue that the far side is a much
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cleaner record of the general bombardment. So why is that?
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Number one, we generate a lot and we, the scientific community,
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generate a lot of dating on the near side but
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the problem is a lot of them they are old
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in the sense like that they have been done a
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while ago where people didn't fully appreciate and understand the
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organ system so now we have a much better understanding
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and we can see that many of those data they
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shouldn't have been interpreted as a real age they were
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modified by subsequent impact Therefore, they were not really dating anything.
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If you clean the database of Argon Age from those
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data that are dubious, then it becomes much clearer. And
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you see that what people have been dating for years
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is one single event. It's embryo. So everything was polluted.
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by embryo. So when people dated so many things, all
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the age were a bit perturbed. So it seems like
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it's a range around 3.9 over like 200 million years. No, actually, no.
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Once you clean that, it's only 3.92 and it's one event.
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So it's a bit of geological bias here. Embryum happened,
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spread all over the surface, and people keep picking those
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rocks that have been affected by embryum. There was never
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any late heavy bombardment. It was just a continuous bombardment
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of the moon. And embryum gave us a false direction,
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if you want. And it's not embryum. It's more like
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because the way the data they were interpreted, they looked
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like they spread, whereas they weren't spreading. Now, with modern eyes,
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you look at those old data and you generate some new.
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You can see that you date one impact basin, maybe
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two with serenitatis as well. But that's about it. So
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you can't really tell that there's many impacts if you
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date only one or two. And a second, after that,
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as we mentioned, you know, you get those dark patches.
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This is the lava flow. So the lava flow, they
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cover and they erase. It's a sort of a natural
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moon erosion. They erase the trace of a previous impact melt.
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So we can't really date anything because a lot of
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it has been erased by the lava flow. So the
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near side record is a bit compromised that way. The
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far side is much cleaner as far as impacts are.
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are concerned because you don't have that many Maya. You
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get really a few and can see that in the
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far side, especially where they landed, the South Pole, Aitken Basin,
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inside the Apollo crater, it hasn't been affected at all
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by embryo. We didn't see any 3.9 age, maybe one,
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very close, but that's about it. So nothing has been
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ejected there.
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It was protected.
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And there was no subsequent big lava plain that covered everything.
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It was a lava flow. I think colleagues dated it
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at 2.8 billion, but that's about it. Not a range
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of lava flow, just one occurrence, at least in the
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rock record we have. So the conclusion of our paper
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is very simple. It's like it builds on what people
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start to suspect. that there was never any late heavy bombardment,
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as simple as that. And frankly, this is much more
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logical that impact had occurred more at the beginning of
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the solar system because there were more asteroids floating around
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and gradually declined and declined until, you know, now it's
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fairly weak. We see small impacts.
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Thankfully.
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Yeah.
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Oh, yeah.
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You can imagine an impact on us, the size of
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South Pole Aitken. So the crater is 2,500 kilometers. You
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compare that with Chicxulub that extinguished the dinosaur at 180 kilometers.
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And another magnitude larger. So you can imagine the effect
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of that on us. So yet, thankfully, we don't see
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that anymore.
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Does this alter things like Nice model or its Charles
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de Grand hypothesis in terms of planetary migration? Does it
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take anything from that? Does it add something to it?
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Does it?
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No, I don't think it's negated. I mean, the way
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the planets are structured, the size, for example, Mars is
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super small and it should be much bigger. And we
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really think like, and again, we are scientists, think that,
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you know, really Jupiter had to migrate to mess up
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things and then went back. But I don't think... People
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can't really use any late heavy bombardment to justify that.
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I don't think the model really truly arose because of
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the late heavy bombardment. It was to justify observation, like
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I said, like mafia is too small and things. And
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they were like, oh, look, we have a demonstration that
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it truly happened because of the late heavy bombardment. They
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can't use that anymore.
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And also because of hot Jupiter exoplanets we see around
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other star systems.
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Yeah, yeah, no, absolutely. I mean, usually they are way
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closer to the sun. And for some reason, ours is
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really far. So, yeah, there's plenty of other things that
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justify the grand tech model. But the late heavy bombardment, well,
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it's not one of them because there was never any
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late heavy bombardment. And like I said, this is not
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our paper that discovered that and everybody's in shock. So
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it's people start to, I started to really question it
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