A Big Whack

As Apollo 14 arrived at the Moon in February 1971, the third stage of its booster rocket slammed into the lunar surface, gouging a crater that was photographed by an unmanned lunar orbiter in 2008. Debris from the impact created bright "rays" around the crater. A seismometer left on the Moon by the crew of Apollo 12 recorded the impact, providing important information about the structure of the Moon. A network of seismometers left by the Apollo missions recorded thousands of moonquakes. [NASA]