PASADENA, Calif. (AP) Surrounded by engineers, NASA chief Charles Bolden inspected a prototype spacecraft engine that could power an audacious mission to lasso an asteroid and tow it closer to Earth for astronauts to explore.
Bolden checked on the progress Thursday a month after the Obama administration unveiled its 2014 budget that proposes $105 million to jumpstart the mission, which may eventually cost more than $2.6 billion.
Engineers at the Jet Propulsion Laboratory in Southern California and Glenn Research Center in Ohio are developing a thruster that relies on ion propulsion instead of conventional chemical fuel.
Once relegated to science fiction, ion propulsion which fires beams of electrically charged atoms to propel a spacecraft is preferred for deep space cruising because it's more fuel-efficient. Engine testing is expected to ramp up next year.
During his visit to the JPL campus, nestled in the foothills of the San Gabriel Mountains northeast of Los Angeles, Bolden viewed an engineering model of the engine and peered through a porthole of a vacuum chamber housing the prototype.
NASA is under White House orders to fly humans to an asteroid as a stepping stone to Mars. Instead of sending astronauts to the asteroid belt between Mars and Jupiter, as originally planned, the space agency came up with a quicker, cheaper idea: Haul the asteroid close to the moon and visit it there.
Bolden said the original concept was impractical given the flat budget and praised the alternative as "ingenious."
"If you can't get to the asteroid, bring the asteroid to you," Bolden said.
The space agency would launch an ion-powered unmanned spacecraft to snare a yet-to-be-selected small asteroid in 2019 and park it in the moon's neighborhood. Then a spacewalking team would hop on an Orion space capsule that's currently under development and explore the rock in 2021.
Besides preparing astronauts for an eventual trip to Mars, NASA said the asteroid-capture mission is designed to test technologies to deflect threatening space boulders on a collision course with Earth.
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NASA head views progress on asteroid lasso mission
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