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Astronauts have put a refurbished pair of gyroscopes into the Hubble Space Telescope after encountering problems with a new set on Friday.

Hubble now has four brand new sets and two refurbished ones.

It took Atlantis mission specialists Mike Good and Mike Massimino approximately two hours to complete the work, which was the top priority of the repair mission.

Later, mission Control confirmed to the astronauts that the gyroscopes and new batteries all worked properly.