a view of the outside of a space station

Replacement of Hubble's Solar Array (2002) Caption Astronauts John M. Grunsfeld, STS-109 payload commander, works in tandem with astronaut Richard M. Linnehan, mission specialist, as the two devote their attention to the replacing one of the Hubble Space Telescope’s (HST) two second-generation solar arrays, which is also know as SA2, and a Diode Box Assembly. Credits NASA