SpaceX rocket hours away from crashing into the moon in unintentional collision

Piece of SpaceX Falcon 9 rocket weighing four tonnes will hit the lunar surface on Wednesday at 5,400 miles per hour A four-tonne piece of a SpaceX rocket that has been floating in space since last year is set to unintentionally crash into the moon at high speed on Wednesday, a collision that poses no danger to Earth but will leave behind a new lunar crater and afford an opportunity for further scientific research. The ​school-bus-size object is the second stage of a SpaceX Falcon 9 rocket that…