#OTD in 1968, @nasa launched its first successful cosmic explorer. Orbiting Astronomical Observatory 2, which could point at and track sources in the sky, is the direct ancestor of current telescopes including @NASAHubble, @chandraxray, and Swift. More: https://go.nasa.gov/3Y2cOIv
#NASAUniverse
#NASAUniverse
50th Anniversary of OAO 2: NASA’s 1st Successful Stellar Observatory
Launched on Dec. 7, 1968, NASA's Orbiting Astronomical Observatory 2, nicknamed Stargazer, was the agency's first successful cosmic explorer — a direct ancestor of Hubble and many other astronomy satellites.Rob Garner (NASA)