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Spacewalking astronauts outfitted the Hubble Space Telescope with new batteries and gyroscopes on Friday. The gyroscopes were the shuttle servicing mission's top priority, as they help the telescope orient itself in space. But one of the three new gyro units did not fit properly, and astronauts had to install a spare instead.
The installation of the gyros took longer than planned, but astronauts Mike Massimino and Michael Good decided to plough ahead with the rest of the day's spacewalk plans to replace three of Hubble's six batteries. To accommodate the extra work, the astronauts' sleep schedule will be pushed forward by one hour.
The space shuttle Atlantis is currently orbiting Earth on an 11-day mission to refurbish the telescope and extend its life until at least 2014