Microbes Could Survive Thin Air of Mars

The Martian surface is presently cold and dry, but there is plenty of evidence suggesting that rivers, lakes and seas covered the Red Planet billions of years ago. Since there is life virtually wherever there is liquid water on Earth, scientists have suggested that life might have evolved on Mars when it was wet, and life could be there even now. "In all the environments we find here on Earth, there is some sort of microorganism in almost all of them," said Rebecca Mickol, an astrobiologist at t