NASA says it found evidence that water recently flowed on Mars

Scientists have discovered definitive evidence of liquid water on the surface of present-day Mars, NASA announced Monday. The find could help answer the question of whether there is life in the solar system beyond Earth, as water is a necessary part of that equation. Satellite images showed streaks left by what appeared to be water flowing downhill, along with salt deposits that would have kept the water from freezing. Scientists said there must have been liquid water there recently to leave the hydrated salt deposits. [The New York Times]