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A astronomy cast episode 686 ice in the shadows. Welcome to astronomy cast for weekly facts

I feel really bad for me. I feel like my yard is green and it is warm and these are all good things.

Your bike is calling to you and yeah. Yeah, yeah, I'm exactly the same way that there are all of these things.

I'm busy on Mondays and I've got to get I got to be near high speed the internet and I got this thing I got to do on Tuesday.

I got an interview on Wednesday. I got this other thing I got it then then on Fridays I do this other thing and and and so.

Nope. Now just day after day after day of sort of internet free existence where I can do work but also be going places and seeing people.

So no, I think it's great. I hope that we are an inspiration to all of you to take a break. Yeah.

If you can or at least get away from the internet if you can. Highly recommend it. But yeah, so we have this episode two more episodes and then we are on summer hiatus.

So just like whatever you need to do to come to grips emotionally with what's about to happen. Go to your happy place because it's coming.

The permanently shadowed craters on the moon are the focus of so much research. That's because they seem to contain vast reserves of water ice.

Water we could use for oxygen, propellant and so much more but also to help us understand where the earth's water came from.

Why? How could there be I guess why would we not expect there to be water? First of all, let's start with this. Why would we not expect there to be water on the moon?

I pretty simple. The moon doesn't really have an atmosphere which means liquid will evaporate away instantly.

The surface of the moon when exposed to sunlight exceeds the melting point of water. So if anything hit by sunlight melts and anything that melts evaporates away and there's no atmosphere.

So anything in the very tenuous and exosphere, it's not fully an atmosphere. We'll get blasted away by like solar wind and stuff.

Water is not going to hang around in general. And so why do we think that there are reserves of water on the moon?

Well, I guess why did we think so before we confirmed them? Why did we think there were good catch?

Yeah, yeah, yeah. So it was realized that while our earth is tilted about 23 degrees and so as it's orientation relative to the sun changes throughout the year, everything gets struck with sunlight pretty much.

There's bottom of them of wells and things like that that can avoid it but on the surface you're pretty much good to go with everything will get sunlight.

The moon however is only tilted like a degree and a half and that little tiny tilt means that there are craters on the north and south pole that when you start working out the geometry and the depth of the craters, the sun literally doesn't shine there.

Ever. Ever. Yeah. You can go to the place where the sun don't shine.

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