A lone researcher may have figured out how Mars was able to support rivers and seas even after the planet had begun to grow cold and its atmosphere thin, and it's all thanks to a cycle of water ...

"It's been such a puzzle that there was liquid water on Mars, because Mars is further from the sun, and also, the sun was fainter early on." New research suggests that temperatures on ancient Mars ...

Thousands of hills and mounds on Mars have been found to contain layers of clay minerals, which formed when running water interacted with the rocks during a period when Mars' northern reaches were ...

Now, NASA’s Curiosity rover has identified two sets of ancient wave ripples on Mars, suggesting the presence of standing bodies of liquid water billions of years ago. Curiosity discovered the ...

"Extending the length of time that liquid water was present extends the possibilities for microbial habitability later into Mars's history," Claire Mondro, a Caltech postdoc who researches the ...