RT @NASA: A theory eliminated in the mystery of how Mars went from a wet world to the dry one we know: go.nasa.gov/1J5XcEf http://t.co/6gJc29YqK7
RT @NASA: A theory eliminated in the mystery of how Mars went from a wet world to the dry one we know: go.nasa.gov/1J5XcEf http://t.co/6gJc29YqK7