OTD…April 9 and STS-59

#OTD in 2002…Atlantis launched the outward expansion of the space station’s truss backbone

#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 2001…Discovery launched on an International Space Station crew exchange mission