OTD…March 6 and Kepler

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

United Launch Alliance called off the launch of a Delta 2 rocket from California’s Central Coast early Tuesday after boats ventured into a restricted safety exclusion zone and engineers ran out of time to resolve a technical problem on the launcher.

#OTD in 1997…Columbia launched on the reflight of her shortened Microgravity Science Laboratory mission