Hubble Space Telescope servicing missions (1993-2009)
NASA sent Space Shuttle crews to repair and upgrade the Hubble telescope five times. Astronauts replaced its flawed optics, gyroscopes, and instruments by hand during spacewalks. Each mission was costly and risked human lives.
Hubble went from a blurry embarrassment to one of the most productive telescopes ever built.
It showed that servicing a satellite in orbit works, but only crewed missions could do it.
The MRV tries to do the repair-and-upgrade job with robots instead of astronauts, removing the cost and danger of sending people.
