Photographic evidence of recent liquid water on Mars
A provocative new study of photographs taken from orbit suggests that liquid water flowed on the surface of Mars as recently as several years ago, raising the possibility that the Red Planet could harbour an environment favourable to life.
The crisp images taken by the Mars Global Surveyor do not directly show water. Rather, they show apparently recent changes in surface features that provide the strongest evidence yet that water even now sometimes flows on the dusty, frigid world. Water and a stable heat source are considered keys for life to emerge.
