How much stuff is orbiting the Earth?
Well, there's the Moon, for starters. Then the Space Station. After that you've pretty much got a few communication satellites, some mysteriously empty space suits and George Clooney. That's it right?
Nope.
In fact there is an incredible amount of stuff orbiting Earth, and it's becoming a serious problem for existing space craft and new launches. Last month the European Space Agency announced a new mision - e.DeOrbit - designed to capture debris with nets or harpoons in order to send it back down to Earth.
"Decades of launches have left Earth surrounded by a halo of space junk: more than 17,000 trackable objects larger than a coffee cup, which threaten working missions with catastrophic collision," ESA said.
"Even a 1 cm nut could hit with the force of a hand grenade."
To prove it they sent out this video of more than 500,000 pieces of debris orbiting the Earth. It's an amazing insight into the scale of the problem.