The year 1991 in science and technology involved many significant events, some listed below. == Astronomy and space exploration == April 5 – Space Shuttle Atlantis leaves an observatory in Earth's orbit to study gamma rays before returning on April 11.
The year 1991 in science and technology involved many significant events, some listed below. == Astronomy and space exploration == April 5 – Space Shuttle Atlantis leaves an observatory in Earth's orbit to study gamma rays before returning on April 11.
Source: Wikipedia "1991 in science" · CC BY-SA 4.0
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