Ridges show evidence of Martian water

Ridges in impact craters on Mars appear to be the fossilized remnants of underground cracks through which water once flowed.

Carbon trapped in soil can re-emerge

It's known that erosion can bury carbon in the soil, acting as a carbon sink - but it now seems that a large part of that sink is only temporary.

Has Titan's surface been recently reshaped?

An analysis of river networks on Titan indicates that some recent phenomenon may have altered the face of Saturn's largest moon.