Asteroid Bennu’s boulders protect it from small meteoroid impacts

Observations of craters on Bennu, one of the two most hazardous known asteroids in our solar system

Researchers, using unprecedented, high-resolution global data sets from NASA's OSIRIS-REx

A surface with many craters is older than a surface with few craters while the crater's size depends on the size of the impactor, 

Since small meteoroids are far more abundant than large meteoroids, celestial objects like asteroids

Bennu's boulders act as a shield, preventing many small meteoroids from forming craters

The researchers also noted that some impactors that do make it through the boulders make small craters.

At Bennu, we discovered something unique to small and rocky bodies, 

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