OTD…April 4 launches of STS-6 and 83

#OTD in 2001…Atlantis launched the Quest airlock module to the International Space Station

OTD in 1969…The launch of Apollo 11 for the first human landing on the moon

#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