'Significant areas of Mars may have once been covered by water': Scientists find hidden clue in Spirit rover data

Scientists found new clues in NASA Spirit rover data showing Mars was once covered by water. Researchers reanalyzed measurements from 2004 to 2010, finding crystalline hematite in Martian soil. Paulo de Souza said, "Significant areas of Mars may have once been covered by water." These findings suggest a wetter past.