Not just water, but salt water, on Mars

NASA scientists unveil new findings from the two Mars Exploration Rovers, Spirit and Opportunity. While both rovers have found evidence of water erosion in rocks at their respective landing sites, the scientists now say that Opportunity’s landing site – a large crater – features rocks which show conclusive evidence of a large body of salt water, not unlike Earth’s oceans. While no definitive signs of life have been found by Opportunity or its identical twin, these findings continue to add up to a picture of Mars as a place where life once could have thrived.