A pair of probes are going to be purposely crashed into the moon by NASA. From the Guardian:

“Two spacecraft orbiting the moon are ending their mission by crashing into a lunar mountain at almost 4,000mph.

The twin gravity recovery and interior laboratory (Grail) probes, known as Ebb and Flow, have spent almost a year mapping the moon’s gravity in unprecedented detail.

With their fuel running low, US space agency NASA took the decision to stage a ‘controlled descent and impact.’

The alternative would have been to let the probes crash randomly which may have damaged places of historic interest, such as the Apollo landing sites.”