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searching for Orbiting Astronomical Observatory 2 1 found (9 total)

alternate case: orbiting Astronomical Observatory 2

Ultraviolet astronomy (855 words) [view diff] case mismatch in snippet view article find links to article

16 (April 1972) + ESRO - TD-1A (135-286 nm; 1972–1974) - Orbiting Astronomical Observatory (#2:1968-73. #3:1972-1981) - Orion 1 and Orion 2 Space Observatories