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Next Mars rover sports a set of new wheels

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Mars rover Curiosity with newly installed wheels. This image taken June 29, 2010, shows the rover with the mobility system -- wheels and suspension -- in place after installation on June 28 and 29. NASA/JPL-Caltech photo.

PASADENA, CALIFORNIA (BNS): A set of new wheels and a suspension system has been added to NASA's next Mars rover, Curiosity.

These new and important touches are a key step in assembling and testing the flight system in advance of a planned 2011 launch, NASA said.

Curiosity, centerpiece of NASA's Mars Science Laboratory mission, is a six-wheeler and uses a rocker-bogie suspension system like its smaller predecessors - Spirit, Opportunity and Sojourner.

Each wheel has its own drive motor, and the corner wheels also have independent steering motors. Unlike earlier Mars rovers, Curiosity will also use its mobility system as a landing gear when the mission's rocket-powered descent stage lowers the rover directly onto the Martian surface on a tether in August 2012.

The mobility system will get functional testing and be part of environmental testing of the rover. The mobility system will now stay on Curiosity through launch unless testing identifies a need for rework that would require it to be disassembled, NASA said.

Curiosity will examine an area of Mars for modern or ancient habitable environments, including any that may have also been favorable for preserving clues about life and environment, though this mission will not seek evidence of life.

It will examine rocks, soil and atmosphere with a diverse payload of tools, including a laser to vaporize patches of rock from a distance and an instrument designed to test for organic compounds.

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