Orbiting Astronomical Observatory
(series of 1960s-1970s NASA space telescopes)
The name Orbiting Astronomical Observatory
(OAO) was used for four NASA
space telescopes launched in the 1960s
and 1970s. Two failed before observing
(OAO-1 and OAO-B).
OAO-2, named Stargazer, was operational
1969-1973 with a number of ultraviolet (UV)
telescopes and was the first successful space telescope.
OAO-3, named Copernicus, was operational from
1972-1981, with both UV and X-ray
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