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NASA Cancels Trip to Supply Hubble, Sealing Early Doom: "Periodic service calls by shuttle astronauts repaired a series of early problems and have continually refurbished the telescope and kept it at the fore of cosmic research. The mission next year would have left the telescope in good shape to continue working through the end of the decade, when NASA plans to bring it down. But the service missions are expensive, more than $500 million each.
More important, NASA officials say, after the Columbia catastrophe a year ago, the missions are also considered dangerous. The shuttles do not carry enough fuel to reach the space station in case of trouble.
In its report on the shuttle disaster last summer, the Columbia Accident Investigation Board recommended that there be a way to inspect and repair the shuttle's heat shields, which were damaged after the Columbia lifted off. That is easily conducted if the craft is at the space station, but not at the Hubble.
In his remarks to the astronomers on Friday, according to those present, Mr. O'Keefe referred to that recommendation and said it would be too difficult to develop that ability for a single trip to the telescope.
Given enough time, NASA might have developed the tools to do it, Dr. Grunsfeld said, but the decision to retire the shuttles in 2010 foreclosed that possibility."
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