So Hubble technicians, eh?

I just watched the "Hubble's Amazing Rescue"

And apparently that friggin' thing is getting serviced constantly, 1993, 1997, 1999, 2002, 2008, 2009.

But the most interesting thing is that it has batteries that die and need replacements. The fact that wide field camera was replaced/upgraded 3 times.

Apparently things never got really repaired in space, but are simply replaced by new units on every space walk, except the mission in 2009 when the astronauts had to take Hubble's guts out and replace with new circuit boards. This had never been done in space because of the amount of screws that were undone and such. With the risk of any screw stripping or getting lost or hitting the mirror would pretty much murder Hubble. But alas, the guys did it.
Astronauts, carried to Hubble by the Space Shuttle Atlantis, installed two new instruments on Hubble during Servicing Mission 4: Wide Field Camera 3 (WFC3) and the Cosmic Origins Spectrograph (COS).
WFC3 sees three different kinds of light: near-ultraviolet, visible and near-infrared, though not simultaneously. The camera's resolution and field of view is much greater than that of previous instruments. Astronauts removed Hubble's Wide Field and Planetary Camera 2 (WFPC2) to make room for WFC3.
COS, a spectrograph that breaks light into its component colors, revealing information about the object emitting the light, sees exclusively in ultraviolet light. COS improves Hubble's ultraviolet sensitivity at least 10 times, and up to 70 times when observing extremely faint objects.
COS took the place of the device installed in Hubble during the first servicing mission to correct Hubble's flawed mirror, the Corrective Optics Space Telescope Axial Replacement (COSTAR). Since the first servicing mission, all of Hubble's replacement instruments have had technology built into them to correct Hubble's marred vision, making COSTAR no longer necessary.


Pretty badass.