Mars lakes and Marsquakes, Mars, map, lake, quakes, sand, USGS. Options

[TheAnt]

Cartography work carried out by USGS have revealed further proof of ancient lake beds and signs of Mars-quakes in the Valles marineris region.

A shorter pressrelease from JPL.

[ectoterrestrial]

Neat but ambiguous. The claim of finding a liquid at the coldest and most insulated place on Mars deserves some healthy skepticism.

All radar can tell us is about changes in index of refraction for that frequency.

On Mars, this gets more interesting as the undigested iron on the surface of the planet contributes to the index of refraction.

This reflection could be the interface between clean ice and dirty ice (or icy dirt).

A 1 meter thickness is an inference from the physics. The vertical resolution is much lower.

[ngunn]

The claim of finding a liquid at the coldest and most insulated place on Mars deserves some healthy skepticism.

Skepticism is always good. However, if there is any significant body of liquid water still present on Mars in this era of scanty atmosphere, then under pressure at the bottom of an icecap is exactly where I'd expect it to be.