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NASA spacecraft on way to asteroid to bring back samples

CAPE CANAVERAL — The first NASA explorer of its kind took off on a seven-year quest Thursday, chasing after a big, black, unexplored asteroid to gather a few handfuls of gravel for return to Earth.

These bite-size bits of ancient space rock from asteroid Bennu could hold clues to the origin of life, not just on our planet but potentially elsewhere in the solar system.

Thousands gathered to witness the evening launch of Osiris-Rex, a robotic hunter that looks something like a bird with its solar wings. The spacecraft took flight atop an Atlas V rocket, which soared a little before sunset on the mission, a U.S. first.

"Here we go!" principal scientist Dante Lauretta of the University of Arizona at Tucson, said via Twitter at liftoff. Victory was declared an hour later; launch controllers shook hands and embraced as the spacecraft shot out of Earth's orbit, bound for Bennu.

Round trip, the SUV-sized spacecraft will travel more than 4 billion miles by mission's end in 2023.

It will take two years for Osiris-Rex to reach Bennu, which is circling the sun in a slightly wider orbit than Earth's. The boxy spacecraft will actually go into orbit around the asteroid, seeking out the best spot before going in for a quick bite.

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