OTD…July 31 and STS-46

#OTD in 1988…Discovery returned Americans to space after the Challenger accident

#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

A mission to service the Hubble Space Telescope blasted off on this date in 2002.