Scientists say that Mars went through three ages, and the first age may have been habitable for life as we know it. Each stage on Mars can be found at nine different locations around the planet Earth today.
12/10/2010 02:10 pm
Life on Mars: A new study has identified a spot that could be a good place to search for fossilized remains of life on Mars.
07/30/2010 08:17 pm
Column: By reexamining early experiments, scientists draw new conclusions.
10/28/2008 01:00 am