Highly Porous Rocks Responsible for Bennu’s Surprisingly Craggy Surface

During fall 2019, NASA’s OSIRIS-REx spacecraft captured this image, which shows one of asteroid Bennu’s boulders with a bright vein that appears to be made of carbonate. The image within the circle (lower right) shows a focused view of the vein. (Credits: NASA/Goddard/University of Arizona)

TUCSON, Ariz. (University of Arizona PR) — Scientists thought asteroid Bennu’s surface would be like a sandy beach, abundant in fine sand and pebbles, which would have been perfect for collecting samples. Past telescope observations from Earth’s orbit had suggested the presence of ­­large swaths of fine-grain material called fine regolith that’s smaller than a few centimeters.

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Asteroid Ryugu Dust Delivered to Earth; NASA Astrobiologists Prepare to Probe It

Artist’s concept of a NASA spacecraft speeding toward a rendezvous with an asteroid. (Credits: NASA’s Goddard Space Flight Center)

By Lonnie Shekhtman
NASA’s Goddard Space Flight Center

GREENBELT, Md. — On Dec. 6 local time (Dec. 5 in the United States), Japanese spacecraft Hayabusa2 dropped a capsule to the ground of the Australian Outback from about 120 miles (or 200 kilometers) above Earth’s surface. Inside that capsule is some of the most precious cargo in the solar system: dust that the spacecraft collected earlier this year from the surface of asteroid Ryugu.  

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