NASA clears shuttle Endeavour for April 29 launch

Endeavour
The shuttle Endeavour was cleared for a launch attempt on April 29 to deliver a new class of physics instrument to the International Space Station on NASA's next-to-last shuttle flight, officials said Tuesday.

Liftoff of the 134th shuttle mission is scheduled for 3:47 p.m. EDT from the Kennedy Space Center in Florida.

The all-veteran crew is led by Mark Kelly, husband of Arizona Democratic Representative Gabrielle Giffords, who is recovering from a January 8 shooting that killed six people and injured 12 others.

Pending approval from her doctors, Giffords, who has not been seen publicly since the attack outside a Tucson, Arizona, grocery store, plans to attend the launch, Kelly has said.

The primary purpose of the flight is to deliver the $2 billion Alpha Magnetic Spectrometer, or AMS, particle detector, an instrument designed to detect dark matter, antimatter and other exotic phenomena.

"It has the potential of returning really Earth-shattering science," said NASA's Bill Gerstenmaier.

A team of 600 scientists from 16 nations, including China and Taiwan, are partners in the project.

After installing AMS the Endeavour astronauts will turn their attention to four spacewalks and other tasks to help get the space station ready for operations without shuttle support. The station is a $100 billion project of the United States, Russia, Europe, Japan and Canada that has been under construction since 1998, 220 miles above Earth.

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