Space Exploration Timeline

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OSO 3 telescope

Mar 8, 1967 – Apr 4, 1982

Observed solar flares from the Sun, as well as a flare from Scorpius X-1.

https://en.wikipedia.org/wiki/Orbiting_Solar_Observatory

Includes events (2):
Mar 8, 1967
Launch of OSO 3 (OSO E1)
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Apr 4, 1982
Re-entry date of OSO 3 (OSO E1)
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