Solar Maximum Mission
- US satellite launched in 1980 for X-ray, gamma ray, ultraviolet and other studies of the Sun at a time of peak solar activity. SMM worked well for 10 months and then broke down, and was repaired in orbit by two astronauts from the space shuttle Challenger in 1984. This repair worked well and the SMM was later used for more solar observations and for viewing Halley’s Comet and other objects.
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