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MCQBeginnerSolar System & Planetary Science
BAAO — 2020 Astronomy & Astrophysics Challenge
Question 1
The year 1990 held many exciting events in astronomy. Which of the following did not celebrate its 30th anniversary this year?
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Source
Source: British Astronomy and Astrophysics Olympiad (BAAO), Astronomy & Astrophysics Challenge 2020. Question text, answer-choice text, and answer were transcribed from the official BAAO paper and solutions PDFs; the explanation and metadata are original.