water on Mars.
Scientists have long debated whether water flowed on the red planet, with
evidence increasing in recent years. The presence of water would raise the
possibility of at least primitive life forms existing there.
Images from a camera aboard NASA's Mars Reconnaissance Orbiter show
alternating layers of dark- and light-toned rock in a giant rift valley.
Layered outcrops can indicate cycles with materials deposited by regular
episodes of water, wind or volcanic activity according to University of
Arizona researchers in Thursday's edition of the journal 'Science'.
Just last December scientists reported evidence that water may be flowing
through Mars' frigid surface. Images from Mars Global Surveyor showed
changes in craters that provide the strongest evidence yet that water
moved through them as recently as several years ago, and is perhaps doing
so even now.
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