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New insights about surface, structure of asteroid Bennu



When NASA’s OSIRIS-REx spacecraft collected samples from asteroid Bennu’s surface in 2020, forces measured during the interaction provided scientists with a direct test of the poorly understood near-subsurface physical properties of rubble-pile asteroids. Now, a new study has characterized the layer just below the asteroid’s surface as composed of weakly bound rock fragments containing twice the void space as the overall asteroid.



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