OTD…April 17 and STS-90

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

Today in 2011, shuttle Discovery made a graceful landing at Kennedy Space Center, returning from her final voyage after a remarkable three-decade life of service.

#OTD in 1997…Atlantis launched on the seventh joint docking mission with Russia’s space station Mir