OTD…Jan. 22 and STS-42

#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 in 1985…Challenger launched the first German Spacelab

#OTD in 1995, Endeavour launched on the ASTRO-2 astronomy mission: