OTD…April 4 launches of STS-6 and 83

#OTD in 2000…Discovery launched on the 100th space shuttle mission

Scott Carpenter launched atop an Atlas rocket to become the second American to orbit the Earth today in 1962, flying for 4 hours and 39 minutes aboard Aurora 7 while making three revolutions of the globe.

#OTD in 2001…Discovery launched on an International Space Station crew exchange mission