Ridges in impact craters on Mars appear to be the fossilized remnants of underground cracks through which water once flowed.
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.
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.
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.
A research team led by Brown University has found evidence of liquid water on Mars much more recently than previously reported.
Carbon dioxide has been the main factor controlling global temperatures for millions of years, according to a new study.