This. I fully agree, it would be a welcome twist in our history. I initially thought it was ice, but according to the information so far is something that is in the same place for too long to be ice (sublimation, sun hitting, etc). Then it is more likely to be another highly reflective material (and note that he appears to created the crater) , so I thought what kind of natural materials would be so reflective that way. It seems to me almost pure or polished metal, would be one of NASA discarded rocket stages that ended up hitting Ceres? Or ... is some kind of rocket, but not from us? :-)