A piece of a SpaceX Falcon 9 rocket, about the size of a school bus, has crashed into the Moon, scientists said. The rocket's upper stage hit the lunar surface unintentionally, carving out a large crater. Scientists said they have 100% confidence in the impact, though they are awaiting imaging to confirm it visually. The crash matches what NASA had predicted. The rocket part had been floating in space since last year. Researchers plan to study the new crater and the lunar dust thrown up by the impact to learn more about crater formation and the effects of cosmic impacts.