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Supermassive black holes are thought to exist in the centers of some galaxies. What would be the Schwarzschild radii of black holes of 1 million and 1 billion solar masses? How does the first black hole compare in size with the Sun? How does the second compare in size with the solar system?

[Hint: Take the radius of the solar system to be 40 AU; the radius of the Sun is 6.96x105km.]

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