Editing Hubble Space Telescope (section)

=== Servicing Mission 3B ===
{{Main|STS-109}}

Servicing Mission 3B flown by ''Columbia'' in March 2002 saw the installation of a new instrument, with the FOC (which, except for the Fine Guidance Sensors when used for astrometry, was the last of the original instruments) being replaced by the [[Advanced Camera for Surveys]] (ACS). This meant COSTAR was no longer required, since all new instruments had built-in correction for the main mirror aberration.<ref name="COSTARNotNeeded">{{cite web |at=Corrective Optics Space Telescope Axial Replacement |title=HST |url=http://www.stsci.edu/hst/HST_overview/index_html#costar |publisher=STScI |access-date=November 4, 2012 |archive-date=July 15, 2022 |archive-url=https://web.archive.org/web/20220715150044/https://www.stsci.edu/hst#costar |url-status=live }}</ref> The mission also revived NICMOS by installing a closed-cycle cooler<ref name="NICMOStemp" /> and replaced the solar arrays for the second time, providing 30 percent more power.<ref>{{cite web |url=http://hubble.nasa.gov/missions/sm3b.php |title=Servicing Mission 3 |publisher=NASA |access-date=April 26, 2008 |url-status=dead |archive-url=https://web.archive.org/web/20080407164008/http://hubble.nasa.gov/missions/sm3b.php<!--Added by H3llBot--> |archive-date=April 7, 2008}}</ref>
{{clear}}