10. On 4 October 1957 the first satellite, Sputnik, was launched.
Since then, thousands of spacecraft have been sent into space.
Every few weeks, new satellites are put into space is being polluted by debris from these space flights. More orbit.
Unfortunately, than 70.000 objects have been left in space.
Parts of rockets have been left.
Old Other items, including a glove, a spanner and a satellites have been abandoned camera, have been lost by astronauts.
The situation up there is becoming dangerous. Both Russian and American spacecraft have been damaged.
An astronaut would be killed if he or she was hit by a piece of rubbish.
It would cost billions of dollars to collect all the debris, but if nothing is done the situation will only get worse.
Sooner or later a satellite will be destroyed by a large piece of rubbish and thousands more pieces of debris will be scattered.
(a) The First Satellite
(b) Dangerous Situation in the Future
(c) The orbit of Spacecraft
(d) The Rubbish Dump in the Sky.