Something just blew up on the Moon.

A couple months ago, NASA witnessed the largest impact on the Moon in 8 years:

“On March 17, 2013, an object about the size of a small boulder hit the lunar surface in Mare Imbrium,” said Bill Cooke of NASA’s Meteoroid Environment Office. “It exploded in a flash nearly 10 times as bright as anything we’ve ever seen before.”

The meteoroid, which weighed an estimated 40 kilograms and was just over a third of a meter wide, hit the Moon at a speed of 90,000 kilometers per hour. NASA said it packed the explosive equivalent of five tons of TNT.

The blast on the moon was so bright that anyone looking at Earth’s closest neighbor at the time of impact could have seen the explosion without a telescope.