In daring mission, NASA is about to snatch pieces of an asteroid


In just a few hours, the world will know whether NASA’s OSIRIS-REx spacecraft successfully reached out and touched Bennu, a tiny, top-shaped asteroid that’s been spinning through the solar system for a billion years. During the maneuver, the spacecraft will swoop down, scoop up a bit of material, and depart seconds later with precious cargo: rocks and dust dating back to the solar system’s birth.

The OSIRIS-REx spacecraft will navigate a very tight area the size of a few parking spaces—26 feet—as it attempts to sample material from the surface of asteroid Bennu.

Guided by a digital map, OSIRIS-REx will fly between giant boulders that ring the landing zone, making for a hazardous descent. The target landing site, highlighted here with a blue circle, is 26 feet wide.

The mission is humankind’s third attempt—and NASA’s first—to sample the surface of an asteroid. The first two asteroid sampling missions, performed by Japan’s Hayabusa and Hayabusa2 spacecraft, picked up only small amounts of fine-grained material. By contrast, OSIRIS-REx is designed to pick up as much as 4.4 pounds of material that ranges in size from tiny grains to two-centimeter-wide pebbles.

On February 11, 2016, OSIRIS-REx underwent environmental testing in a Lockheed Martin thermal vacuum chamber. Launched nearly seven months later on September 8, 2016, the spacecraft is now more than 200 million miles from Earth—and poised to touch the surface of another world.

Assuming all goes well, a radio dish in Spain will receive the signal that OSIRIS-REx completed its task at 6:12 p.m. ET on October 20. The spacecraft will depart Bennu in March 2021, reaching Earth two and a half years later to eject the sample-filled capsule, which will parachute to the deserts of Utah for collection and study.

If successful, OSIRIS-REx will provide a wealth of insight into Bennu‘s history, and perhaps help scientists better understand the origins of water and life on Earth.

“Asteroids are like time capsules floating in space that can provide a fossil record for the birth of our solar system,” Lori Glaze, the director of NASA’s planetary science division, said in a press briefing on October 19. “They can provide valuable information about how the planets—including our own—came to be.”

Some space rocks also pose a threat to life’s future—and that includes Bennu. NASA estimates there’s a 1-in-2,700 chance of Bennu colliding with Earth sometime in the late 2100s. Decades from now, if future measurements confirm a collision course, data from OSIRIS-REx would help scientists monitor the asteroid and alter its orbit to avert a potentially catastrophic impact.

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