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Hellas Impact Basin

Target Name:  Mars
Spacecraft:  Mars Global Surveyor
Produced by:  GSFC/NASA
Copyright: Public Domain
Date Released: 27 May 1999

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The massive Hellas impact basin in the Southern Hemisphere is another striking feature on Mars. Nearly six miles (nine kilometers) deep and 1,300 miles (2,100 kilometers) across, the basin is surrounded by a ring of material that rises 1.25 miles (about two kilometers) above the surroundings and stretches out to 2,500 miles (4,000 kilometers) from the basin center.

This ring of material, likely thrown out of the basin during the impact of an asteroid, has a volume equivalent to a two-mile (3.5-kilometer) thick layer spread over the continental United States, and it contributes significantly to the high topography in the Southern Hemisphere.

Copyright © 1995-2016 by Calvin J. Hamilton. All rights reserved.