OTD…July 12 and STS-104

#OTD in 1994…Discovery launched to develop new techniques for monitoring Earth’s environment from space…and in 2006…Construction of the space station resumed as Atlantis delivered a power-generating truss

#OTD…America’s first shuttle launch in 1981 and another in 1985

#OTD in 1985…Challenger suffered an engine shutdown on her way to orbit for a Spacelab mission