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Jul 30, 2012 7:09 PM by Lacey Steele

New Mars mission begins this weekend

NASA's most ambitious and expensive Mars mission begins this weekend with the arrival of the smartest rover ever built.

Like an Olympic gymnast, the rover must "stick the landing."

It won't be easy.

The touchdown for the rover called Curiosity is so risky it's been described as "seven minutes of terror." That's the time it takes to slow down from a blazing 13,000 mph to a complete stop with the help of a parachute, heat shield and rockets.

In a new twist, the rover will be lowered by cables from a hovering spacecraft.

Scientists on Earth won't know for 14 minutes whether Curiosity safely landed Sunday night.

If all goes well, Curiosity will spend two years trying to figure out if the Mars environment was once suitable for microbes.

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