OTD…June 17 and STS-51G

#OTD in 1997…Cassini was launched on its billion-mile trek to Saturn

#OTD in 1991…Atlantis launched another of NASA’s Tracking and Data Relay Satellites

The flight of Gemini 4 launched today in 1965 for NASA’s first Extra Vehicular Activity spacewalk by Ed White on a four-day orbital mission with commander Jim McDivitt.