Rocks on Bennu are Cracking Because of the Constant Day/Night Cycling

Asteroid Bennu is blanketed by rocks and huge boulders. And now that the OSIRIS-REx spacecraft is taking a close look at those rocks, researchers are able to see something surprising for an airless body: the rocks have tiny cracks and fissures.   The cause? Most likely the cracks are from wide variations in temperatures, with …