In 2014 the International Space Station had to move three times to avoid lethal chunks of space debris, while satellites are mysteriously breaking down. With first-hand accounts from astronauts and experts, Killer Space Junk reveals the scale of the problem of space junk. Our planet is surrounded by hundreds of millions of pieces of junk moving at 17 000 miles per hour. Now the US government is investing a billion dollars to track them, and companies around the world are developing ways to clear up their mess – from robot arms, to nets, to harpoons.