The telescope
SM3A: A Radio Transmitter is being replaced
December 16, 1999 · ESA/Hubble · HST , Hubble Space Telescope , SM3A
Astronaut John M. Grunsfeld, positioned on a foot restraint on the end of Discovery's remote manipulator system (RMS), prepares to replace a radio transmitter in one of the Hubble Space Telescope's electronics bay.
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