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BAAO — 2023 Astronomy & Astrophysics Challenge
Question 6
What is the Messier number of this object?
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Source
Source: British Astronomy and Astrophysics Olympiad (BAAO), Astronomy & Astrophysics Challenge 2023. Question text, answer-choice text, and answer were transcribed from the official BAAO paper and solutions PDFs; the explanation and metadata are original.