Astronomers now think that there is a black hole with more than 4 million times the mass of our Sun at the center of our Galaxy? Roughly how large would the event horizon of such a supermassive black hole be? a. the size of our Moon b. about 4 light years across c. about 17 times the size of the Sun d. about the size of an atom (so much mass really compresses the event horizon) e. we canâ€™t answer this question without knowing exactly what kind of stars were swallowed by the black hole

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19-11-2021
Physics

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Astronomers now think that there is a black hole with more than 4 million times the mass of our Sun at the center of our Galaxy? Roughly how large would the event horizon of such a supermassive black hole be? a. the size of our Moon b. about 4 light years across c. about 17 times the size of the Sun d. about the size of an atom (so much mass really compresses the event horizon) e. we canâ€™t answer this question without knowing exactly what kind of stars were swallowed by the black hole

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sandlee09 sandlee09 · Answer 1 · 2021-11-24T12:03:17+01:00

Given what we know about the astronomical units of space occupied by supermassive black holes, we can confirm that the event horizon in question is roughly 24million km across. Though no option given evaluates to this number, the closest is option c "about 17 times the size of the sun", which equates to the radius of the event horizon.

When comparing sizes, the universe can quickly make even the most massive object appear to be very small. The sun, which is large enough to make the earth look like a speck of dust in comparison, is roughly 700,000 km across. Though this is indeed a massive distance, it is only 1/35th the size of the event horizon in question.

The "Supermassive Black Hole" at the center of our galaxy is known as Saggitarius A. This black hole is said to be 4 million times the mass of our sun. Despite this, however, due to the highly compressed nature of black holes, it is only about 35 times larger than our sun. Option C comes close at 17 times larger but is only about half of what the event horizon for this black hole is.

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