The sample contained traces of sulfur, nitrogen, hydrogen, oxygen, phosphorus, and carbon -- key chemical ingredients for life.
For astronomers, the news constitutes the latest clue in their pursuit of a scientific holy grail: Answering the big question about whether life ever existed on the Red Planet. Their challenge until now has been to confirm whether the Martian atmosphere could have supported a habitable environment. The preliminary evidence now suggests the answer is yes, with the rock samples pointing to evidence that conditions on Mars were once favorable for life. A couple of particularly intriguing clues: The presence of clay as well as the absence of "abundant salt" point to the likely existence of an ancient environment where there was fresh water, according to NASA.… Read more