"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 ...

Building on prior theories describing the Mars of yore as a hot again, cold again place ... "It makes a really great case ...

But these hot and cold spells may have been detrimental to life if it existed on the Red Planet. Mars may be a dry and arid planet today, but scientists know that Earth's neighbor was much wetter ...

New research suggests that ancient Mars might have experienced alternating hot and cold periods, enabling it to retain liquid ...

What does NASA's discovery of odd popcorn rocks on Mars actually mean? It has discovered an oddly textured rock similar to ...

The superheated spring is also a sought-after location for microscopic organisms known as thermophiles, which thrive in hot .