Did it rain or snow on ancient Mars? New study suggests it did

NASA’s Perseverance Rover Finds Strange Rocks on Mars

A rock containing many smaller round stones could indicate that there was once a large amount of liquid water on the Red Planet.

Mars is covered in evidence of ancient lakes, rain and snow — but scientists aren't sure how that's possible

Valleys on Mars suggest the Red Planet was once covered in flowing water — but it's still a mystery how that could have been.

New simulations show how rain and snow could have shaped the landscape on Mars – but a mystery remains unsolved.

Scientists find subtle clues ancient Mars had rainy days, too

Ancient Mars likely had rainy days to feed its rivers and lakes, a new study suggests, challenging theories it lacked precipitation.

Mars may have once had rain and rivers, new study suggests

Mars may have experienced rainfall and river flow billions of years ago, reshaping the Red Planet's surface and supporting a once wetter and warmer climate, according to a new study published in the Journal of Geophysical Research. Researchers from the University of Colorado at Boulder used computer simulations to compare two competing theories about ancient Mars: one positing a cold, icy world with brief thawing periods, and the other a planet …

Groundbreaking study finds Mars may once have had rain and snow

Research provides new insights into evolution of Red Planet