Water on Mars

NASA has reported that images from the Mars Global Surveryor, taken in 2004 and 2005, show that water flowed onto the surface of Mars on at least two occasions within the last seven years. While liquid water would quickly freeze or evaporate, it apparently carried new sediment downhill in craters in the Terra Sirenum and Centauri Montes regions of the planet, leaving very distinct traces of its eruption onto the surface.