When you stare up at the moon, somewhere on the lunar surface lie the remains of Apollo 11, 12, 14, 15, 16 and 17 along with 8 unmanned Russian Luna missions and 5 pre-Apollo unmanned American surveyor missions.

So why can’t we see them? The reason is explained in this video, and it’s mainly because you’d need a very, very powerful telescope. Even more powerful than the most powerful one on earth, in fact it would need a mirror ten times its size.