OTD…Jan. 28 and STS-51L

#OTD in 1991…The launch of Columbia on Spacelab Life Sciences 1 mission

#OTD in 2007…Discovery launched Harmony as the gateway to future international science laboratories

NASA’s Kepler planet-finder began its mission to discover Earth-like worlds orbiting other stars in the galaxy today in 2009, successfully launching aboard a Delta 2 rocket from Cape Canaveral.