Early on Wednesday, the discarded upper stage of a Falcon 9 rocket built by Elon Musk’s SpaceX will unintentionally slam into the moon. Amateur astronomers quickly located the rocket stage, and Mr. Gray kept tabs on it. “It was clear that the object’s orbit would cross that of the moon,” Mr. Gray said. For the SpaceX rocket stage, Mr. Jo produced simulations of what would be kicked up if the stage came down vertically. The post A SpaceX Rocket Is Headed for a Crash on the Moon appeared first on New York Times.