https://www.nasa.gov/feature/goddard/2020/bennu-top-ten
It appears that some pieces of asteroid Vesta ended up on asteroid Bennu, according to OSIRIS-REx, aka Origins, Spectral Interpretation, Resource Identification, Security, Regolith EXplorer. The new result sheds light on the Intricate orbital dance of asteroids and the violent origin of Bennu, which is a rubble pile that coalesced from the fragments of a massive collision. Six boulders, ranging in size from 1.5 meters to 4.2 meters, are scattered across the surface of Bennu’s southern hemisphere. Near the equator .The boulders are much brighter than the rest of Bennu, with some 10x times brighter! The team tested the rocks and found that the rocks were mostly made of pyroxene. There are a few ways to get pyroxene, and one is if rocks get very hot. The heating probably did NOT happen, since Bennu is a very water-rich asteroid. Then the team considered local heating, like with asteroid strikes. That also probably didn’t happen, because the force of the asteroid would have blown the asteroid to pieces! They considered other scenarios, and found that maybe, a piece of Vesta found its way onto Bennu! coooool.
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