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BAAO — 2020 Astronomy & Astrophysics Challenge
Question 4
The Ring Nebula, M57, is surrounded by thin shells of out-flowing material, the outermost (and faintest) of which is measured to have an angular diameter of 230 arcseconds (where 1 arcsecond = 1/3600th of a degree). Given the nebula is 787 pc from Earth, estimate its radius.
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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.