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MCQAdvancedGalaxies & Extragalactic Astronomy
BAAO — 2020 Astronomy & Astrophysics Challenge
Question 9
The event horizon of a non-spinning, uncharged black hole can be thought of as a sphere with a radius equal to the Schwarzschild radius, rₛ = 2GM/c² where M is the mass of the black hole and c is the speed of light. If the black hole at the centre of the Milky Way has a mass of 4.15 × 10⁶ M☉, what is the approximate average density within the event horizon?
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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.