A massive explosion, equivalent to five tonnes of TNT annihilating our satellite's surface, hit the poor Moon back in March. It created a bright flash that glowed like a 4th magnitude star, and could be seen by the naked eye, but apparently no one spotted it, until now.
The impact saw a 40kg mass smash into our poor lunar satellite at some 56,000mph. Ouch. The resulting immense flash was 10 times brighter than we've ever seen before, marking this as a rather unusual event and getting astronerds salivating. Apparently similar presumed meteors also hit Earth that night, but we were protected by our atmosphere.
The impact happened back in March, but has only just been spotted by NASA's equipment permanently pointed at the Moon. NASA says the event was especially violent, and is redirecting the Lunar Reconnaissance Orbiter to go take a peek. We're assuming that it's just a meteor, rather than some alien craft that spun out of control, but then, it could be the Decepticons back or something. They're blatantly busy building a base on the dark side of the Moon. I, for one, welcome our robot overlords. [NASA via The Register]