Ridges show evidence of Martian water

Ridges in impact craters on Mars appear to be the fossilized remnants of underground cracks through which water once flowed.

What if Mars astronauts get sick?

A spacecraft really wouldn't be a great place to suffer from, say, salmonella poisoning - but new research indicates that microgravity and prolonged space flight could give unique advantages to germs.

Evolution triggered by climate change

Six distinct waves of mammal species diversity in North America over the last 65 million years were driven primarily by climate change, new research suggests.

Mars discovery shows 'recent' habitable region

Brown University planetary geologists have identified a spot on Mars which they say could have been one of the most recent habitable microenvironments on the planet.

Team finds evidence of recent water on Mars

A research team led by Brown University has found evidence of liquid water on Mars much more recently than previously reported.

CO2 has controlled climate for millions of years

Carbon dioxide has been the main factor controlling global temperatures for millions of years, according to a new study.