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If we want to establish a colony on the Moon, coming up with enough water is a huge challenge. Scientists have long suspected there might be water hiding on the lunar surface. Were they right? Plus, some quick recovery work led to exciting discoveries from chunks of a meteorite!

Hosted by: Hank Green

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Sources:
https://www.nature.com/articles/s41550-020-01222-x
https://www.nature.com/articles/s41550-020-1198-9
https://www.eurekalert.org/emb_releases/2020-10/uoca-tms102120.php
https://www.nasa.gov/press-release/nasa-s-sofia-discovers-water-on-sunlit-surface-of-moon/
https://www.eurekalert.org/emb_releases/2020-10/fm-mc102120.php
https://onlinelibrary.wiley.com/doi/full/10.1111/maps.13584

Image Sources:
https://www.nasa.gov/press-release/nasa-s-sofia-discovers-water-on-sunlit-surface-of-moon/
https://www.istockphoto.com/photo/footprints-on-moon-gm173711090-25589315
https://www.istockphoto.com/photo/transfer-pipe-in-water-purification-plant-holding-tanks-background-gm157403404-8213979
https://www.nasa.gov/centers/goddard/news/features/2010/lhg.html
https://www.nasa.gov/topics/moonmars/features/clark3.html
https://www.nasa.gov/press-release/nasa-s-sofia-discovers-water-on-sunlit-surface-of-moon/
https://www.nasa.gov/directorates/heo/scan/services/missions/solarsystem/LRO.html
https://commons.wikimedia.org/wiki/File:Crookes_crater_AS11-42-6247.jpg
https://www.eurekalert.org/multimedia/pub/246561.php?from=481354
https://www.eurekalert.org/multimedia/pub/246562.php?from=481354
https://commons.wikimedia.org/wiki/File:Weston_meteorite.jpg
https://onlinelibrary.wiley.com/doi/full/10.1111/maps.13584
{♫Intro♫}.

The idea of a Moon colony has been a staple of science fiction since before humans even started going to space. But even five decades after the first lunar bootprints, the idea of sustaining astronauts on the Moon long-term has a lot of challenges.

Like access to water, which is a big deal for sustaining humans. It is not practical, and it is definitely not cheap to lug water all the way from the. Earth to the moon.

So it would be great to know if the Moon has any water of its own. And this week in Nature Astronomy, two papers have given us new insight into how much water the Moon may actually hold. Now, this desolate, gray world might be the last place you’d expect to find good ‘ol H2O.

But we know that water comes in lots of forms all over space—and they’re not all obvious. So, scientists suspected it was possible some was hiding out on the Moon. For instance, water might have gotten carried to the surface on micrometeorites.

Then, it may have either gotten trapped inside the impact sites, or scattered into the super-thin layer of gas surrounding the Moon. It might also have formed on the Moon itself from chemical reactions between molecules containing hydrogen and oxygen. And back in 2009, an orbiter circling the Moon even found possible evidence of water ice near the Moon’s south pole.

But scientists weren’t 100% sure if this was really water, or something else with hydrogen and oxygen that shared a similar chemical fingerprint. To figure it out, one team used the airborne infrared telescope called SOFIA, which flies inside a modified Boeing 747. It observed the Clavius Crater in the Moon’s southern highlands using a slightly longer wavelength than the 2009 study.

At this wavelength, if there were water, its unique chemical fingerprint should be possible to distinguish. And that hunt was successful—astronomers detected water ice in the crater. It wasn’t much—there was less than a gram of water for every kilogram of other material, which makes it 100 times drier than the Sahara.

But still, it was something. The researchers believe the water is trapped within the glassy material that formed during the high temperatures of a meteorite impact. Although it’s also possible the water could be packed between grains of lunar dust, which could shield it from the harsh environment.

Either way, we’re not looking at something that astronauts could chop and put into their mixed drinks or anything, but they could potentially still harvest it. And this may not even be the only place there’s water on the Moon. Astronomers have hypothesized for a while that water could hide out in craters and pockets that are permanently shadowed, called cold traps.

So in a second study in the same issue of Nature Astronomy, researchers used data from the Lunar Reconnaissance Orbiter, along with computer modeling, to see how many of these pockets are out there. And the answer turns out to be… a lot. Some of these cold traps are as small as a single centimeter in diameter, but between those and a bunch of larger ones, researchers estimated that these regions could cover an area roughly 40,000 square kilometers in size.

That’s roughly as large as Switzerland. Many of those cold traps are near the poles, where the sunlight’s low angle leaves more areas permanently in shadow and the temperatures stay cold. The study didn’t attempt to see how many of these cold traps actually had water, but it gives us a starting point for estimating how many places water could hide out.

Meanwhile, in other space news, scientists have released their findings from another exciting discovery here on Earth. Back in 2018, a 50-kilogram meteoroid burned through the Earth’s atmosphere, and a few surviving chunks landed in Michigan. Scientists quickly recovered them, and now, in a study published Tuesday in the journal.

Meteoritics & Planetary Science, they’ve shared what this space rock can tell us about the origins of our solar system. See, small asteroids and meteoroids are kinda like cosmic time capsules. They formed along with our solar system roughly four and a half billion years ago.

But unlike planets, which undergo a lot of transformation over time, these rocks are basically unchanged. So they retain the memories of what the early solar system looked like. The problem is, once they smash into Earth, they get exposed to new chemical and physical processes that begin to destroy their records.

So the quicker you can find a meteorite, the more intact the time capsule will be. And in this case, scientists got right on it. In less than two days, they managed to collect six major pieces, and ultimately, they retrieved a whole kilogram of debris.

Then, they sent samples to a couple of labs for analysis. The rocks turned out to be a special type of iron-rich stony meteorite called an H4 chondrite. Chondrites are basically ancient aggregations of tiny rocks that got smushed together.

And thanks to the rapid harvesting, the composition of these samples was still mostly undisturbed. When scientists examined them, they found tens of thousands of complex organic molecules hanging out in them—which is exciting. Organic molecules are the reason we are here—they’re the reason life exists.

But we don’t know for sure where they come from, and one hypothesis is that they were introduced by meteorites. So this finding suggests that it’s at least possible that similar rocks could have brought a whole range of chemicals to our infant Earth to help spark the processes that eventually led to life. And it’s kind of incredible that a few shards of burned-up rock can give us a glimpse back to a time before the Earth as we know it even existed.

Thanks for watching this episode of SciShow Space News! And a special thanks to all our patrons who make this show possible. If you want to find out what you can do to help keep SciShow going, you can find out more at patreon.com/SciShow. ♫Outro♫}.