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flag X-ray scans of Bennu samples reveal cracked, porous rocks explaining rapid surface heating and cooling, solving a long-standing mystery.

flag On March 17, 2026, NASA announced that X-ray scans of samples from asteroid Bennu revealed extensive internal cracks in its boulders, explaining why the surface showed low thermal inertia—rapid heating and cooling—despite appearing rugged. flag This resolves a long-standing mystery: earlier telescopic data suggested a sandy surface, but the OSIRIS-REx mission found few such areas. flag The porous, fractured rocks allow heat to dissipate quickly, matching thermal observations. flag The findings, based on Earth-based analysis of returned samples, enhance understanding of asteroid composition and have implications for planetary defense and space resource use.

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