Climate satellite: Threat of being hit '1 in 20 trillion'
The US space agency Nasa says that its out-of-control climate satellite is expected to crash to Earth sometime on Friday evening (GMT).
Nasa says the risk to life from the Upper Atmosphere Research Satellite (UARS) is 1 in 3,200.
But "the odds of you as an individual being hit by this are around one in 20 trillion", Dr Robert Massey of the Royal Astronomical Society told the BBC.
- 23 September 2011
- BBC News