New Images of Dao, Niger, and Harmakhis Valles on Mars

By Keith Cowing
October 5, 2000
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Dao Vallis, MarsAccording to NASA JPL “The Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) opened its fourth year orbiting the red planet with this
mid-autumn view of three major valley systems east of the Hellas plains. From left to right, the first major valley, Dao Vallis, runs
diagonally from the upper left to just past the lower center of the image. Niger Vallis joins Dao Vallis just above the center of the
frame. Harmakhis Vallis extends diagonally across the right half of the picture, toward the lower right. These valleys are believed by
some to have been formed–at least in part–by large outbursts of liquid water some time far back in the martian past, though there
is no way to know exactly how many hundreds of millions or billions of years ago this might have occurred. In each valley, water
would have flowed toward the bottom of the image. Although their dimensions vary along their courses, the valleys are all roughly 1
km (0.6 miles) deep and range in width from about 40 km (25 miles) down to about 8 km (5 mi). Located around 40°S, 270°W, the
picture covers an area approximately 800 km across and is illuminated by sunlight from the lower left. North is toward the left; the
picture is a composite of red and blue wide angle images obtained by MOC on September 13, 2000.”

Related link

  • Higher resolution images and animations, NASA JPL/Malin Space Scinece Systems

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