Perhaps the most controversial of the possible signs of water on Mars are recurring slope lineae, which are dark streaks that ...

A strange rock on Mars is raising new questions about the possibility of ancient microbial life on the Red Planet. According ...

A rock on Mars that may hold clues about ancient microbial life on the Red Planet continues to puzzle scientists.

The intriguing chemistry of a rock collected by the Perseverance rover could trace to microbial activity — or not.

Step aside, Santa Monica. It seems that Mars once had beaches that would give the Californian coast a run for its money.

The lines were later revealed to be illusory, perhaps caused by streaks of dust carried by the wind. For life to exist on Mars, there must be liquid water. There is plenty of water on Mars ...

Mars was once wet, with rivers and lakes and even an ocean that existed on the Red Planet between about 4.1 and 3.7 billion years ago. That liquid water has now all gone, either frozen into polar ...

An arrowhead-shaped rock on Mars sporting features that may hint at ... which runs along the inner wall of the crater. The rock features spots of black, blue, or greenish hues, which the ...