Water on Mars?

Water on Mars?

Scientists think life requires liquid water, but Earth was the only planet known to have water until spacecraft observations of Mars in the 1970s and later proved that at least one other world once possessed this liquid gold. Images of ancient river deltas taken from orbit and analysis of rocks from rovers on the surface settled the case for water on the Red Planet.

Read it here:
http://www.nasa.gov/mission_pages/MRO/multimedia/pia14472.html