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Space Shuttle Challenger is launched on STS-51-B.
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Space Shuttle Challenger
Space Shuttle orbiter (1983–1986)
Space Shuttle Challenger (OV-099) was a Space Shuttle orbiter manufactured by Rockwell International and operated by NASA. Named after the commanding ship of a nineteenth-century scientific expedition that traveled the world, Challenger was the second Space Shuttle orbiter to…Source: Wikipedia (CC BY-SA)
STS-51-B
1985 American crewed spaceflight
STS-51-B was the 17th flight of the NASA Space Shuttle program and the seventh flight of Space Shuttle Challenger. The launch of Challenger on April 29, 1985, was delayed by 2 minutes and 18 seconds, due to a launch processing failure. Challenger was initially rolled out to the…Source: Wikipedia (CC BY-SA)
April 29
Day of the year
April 29 is the 119th day of the year in the Gregorian calendar; 246 days remain until the end of the year.Source: Wikipedia (CC BY-SA)