NEW YORK (AFP) : A SpaceX rocket’s upper stage is set to unintentionally crash into the Moon on Wednesday, a collision that poses no danger to Earth but will leave behind a lunar crater. It is expected to slam into the Moon’s northern hemisphere near the Einstein Crater, at some 5,400 miles per hour (8,690 kilometers per hour). The booster returned to Earth, but the upper stage stayed in space to push the landers onward. NASA hopes to soon establish a sustained human presence on the Moon, making it critical to better understand space debris in lunar orbit. The Moon routinely weathers impact from space debris including meteoroids.