26 September 2011
Last updated at 14:10
A satellite the size of a bus plunged into the Pacific Ocean on Saturday morning.
Scientists think most of it burnt up when it passed through the atmosphere and the rest fell into the sea off the US coast.
So far there are no reports of anyone finding any bits of the satellite or of anyone being hurt.
But Space agency Nasa warns that if you do find any bits, not to touch them and to call the emergency services.
The satellite was the biggest American space agency satellite to return into the Earth's atmosphere by itself in about 30 years.
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