(Image Credit: ESA/DLR/FU Berlin, CC BY-SA 3.0 IGO)
Mars has a lot of interesting surface features, and a new study claims to have decent reason to believe that many of the structures which resemble fluvial stream networks on Earth were formed by the same processes on Mars. Namely, it speaks to the existence of a climate and atmosphere which was able to support frequent and heavy rainfall, on a planet that may have been much wetter than even we had thought.
This all goes to show that Mars continues to surprise us, the more we learn about it, and that the vast undertaking of coming to terms with an entirely new celestial body is more meaningful and challenging than we can imagine.