November 13, 1999
Since the second Servicing Mission in February 1997, three of Hubble’s six gyroscopes had failed, causing some concern among NASA officials. At the time,...
December 19-27, 1999
In Part A of the two-part Third Servicing Mission, astronauts replaced the telescope’s six gyroscopes, which help the orbiting observatory point at celestial...NASA Space Shuttle Discovery Mission STS-103: Hubble Servicing Mission 3A