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The red planet may have once been home to an abundance of microbes. New studies suggest it's possible that some hardy microbes managed to survive underground in a frozen state.

This image from NASA's Mars Odyssey shows a small portion of both Dao Vallis and Niger Vallis.

A new study suggests that billions of years ago microbes may have thrived on Mars before succumbing to freezing temperatures of their own making

Researchers simulated the conditions hypothetical lifeforms would have encountered on Mars 4 billion years ago.

Life might have wiped itself out on early Mars.

A new study has found that ancient Mars may have been able to support a large population of microscopic organisms. The study suggests the microorganisms might have been growing just beneath the Mars surface about 4 billion years ago.

The ancient microbes on Mars, according to computer simulations, may have produced methane which caused climate cooling.

Early in its history, the red planet likely would have been habitable to methanogens, microbes that make a living in extreme habitats on Earth, according to a study that simulated the conditions on a young Mars.  

Researchers at the University of Arizona's Department of Ecology and Evolutionary Biology simulated the conditions that hypothetical life forms would have

If the hydrogen-gobbling, methane-producing microorganisms existed, they would have caused their own demise