NASA’s OSIRIS-REx Is About to Bring Asteroid Pieces Back to Earth

Seven years after it left for the near-Earth asteroid Bennu, NASA’s OSIRIS-REx spacecraft is returning with a celestial souvenir. On the morning of Sunday, September 24, as it passes by Earth the probe will release a canister holding about 9 ounces of space rock. The container will plummet through the atmosphere, its parachute will unfurl, and it will touch down in the Utah desert at about 8:55 am Mountain time.

Assuming its contents survive the journey unscathed, the return will mark a tantalizing step forward for planetary science. Researchers have long salivated over the prospect of examining pristine asteroid fragments. While meteorites—which are often broken chunks of asteroids—fall from the

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