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What feature of M87 helped scientists determine the presence of a supermassive black hole? fast orbiting gas near the center indicating a mass three billion

What feature of M87 helped scientists determine the presence of a supermassive black hole? fast orbiting gas near the center indicating a mass three billion times that of our sun, long range telescopic images of its stars, the discovery of neutron stars orbiting its core, or the color variation over decades

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