July 20, 1969: Lunar landing of Apollo 11

#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 2007…NASA’s Dawn probe launched to explore the uncharted worlds of Vesta and Ceres in the heart of the asteroid belt.