Lynn Carter

Um, Jezero crater is really small, so, uh, you know, we haven't seen any subsurface interfaces, so it's kind of disappointing that there's nothing there.

Um, but we did look and the hope is definitely to use RIMFAX, um, you know, at least to understand this, the site types of layering that you have, and then maybe we can use that to help interpret charade other places where we see layering.

Yeah, so I'm trying to remember what that was.

the thickness of the deposit once you get through that overburden layer.

Yeah, it's too bad Allie's not here, because she would know the answer to this off the top of her head.

This is her thesis.

But yeah, I think it's tens of meters.

Yep, that's a good question.

So it's about a kilometer wide, which is actually kind of bad because we would like to have it narrower so that we can distinguish where the echoes are coming from.

Actually, a long track, it's better.

We get hundreds of meters.

But because the wavelength is so long and it's a dipole, we just see stuff coming back from pretty far away.

So I guess like ultrasound, that's sound waves in the air.

So that's compressing the air.

But light is, you know, it's like the same as visible light.

It's just really long wavelengths.

So it's not the same as ultrasound and things like that.

you know ultrasound doesn't travel through a vacuum because you can't compress anything in a vacuum but light will still travel through a vacuum and in terms of whether you consider it long wavelength or short wavelength or whatever yeah there's a lot of disagreement between people about what constitutes long and short wavelengths so I've had people refer to some of my instruments as microwave instruments some people refer to them as radio and I mean there are spectral bands so you can look at the bands and some of them are called

millimeter or you know whatever but people use it informally just they say anything pretty much I mean once you get past a certain boundary region between the two of them they're pretty fixed on a certain frequency range but but yeah definitely I've heard a lot of confusion about the difference between microwaves and radio waves and what are long radio waves and what are short radio waves and things like that

So names on Mars have to be approved by the International Astronomical Union.