sts-61g

STS-61-G was a United States Space Shuttle mission planned to launch on 20 May 1986 using Atlantis. The main objective of this mission was to launch the Galileo spacecraft towards Jupiter using the Centaur-G upper stage. It was cancelled after the Challenger disaster.
Randy Hunt made a limited number of this reproduction of a mission that was canceled due to the Challenger mishap. This mission was to launch Galileo. There are only 50 of these patches in existance.

Galileo was an unmanned NASA spacecraft which studied the planet Jupiter and its moons, as well as several other solar system bodies. Named after Renaissance astronomer Galileo Galilei, it consisted of an orbiter and entry probe. It was launched on October 18, 1989, carried by Space Shuttle Atlantis on the STS-34 mission. Galileo arrived at Jupiter on December 7, 1995, after gravitational assist flybys of Venus and Earth, and became the first spacecraft to orbit Jupiter. It launched the first probe into Jupiter, directly measuring its atmosphere.  Despite suffering major antenna problems, Galileo achieved the first asteroid flyby, of 951 Gaspra, and discovered the first asteroid moon, Dactyl, around 243 Ida.