Astronauts repair and upgrade the Hubble Space Telescope during the first servicing mission to that orbital observatory, in 1993. NASA is now studying how telescopes far larger than Hubble might someday be assembled and serviced in space by astronauts or robots.
After snapping the final piece into place with a satisfying "click" she feels through her spacesuit gloves, the astronaut pauses to appreciate the view.
From Scientific American
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