This Thursday, Nasa expects to launch the Hubble space telescope, which promises the greatest advances in astronomy since Galileo. It will show ten times more details than is possible from the ground and see objects 30 times fainter or five times farther away than ever before. It will search for planets outside our solar system, and will tell us much more about the Universe. With long delays and huge cost-overruns, it is now approaching its point of greatest risk. If anything goes wrong on the launch, there is no back-up.
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