English, 05.02.2021 02:30 cp838761

Astronomers found stars careening around these centers, zooming at previously unheard-of speeds in their orbits. The motion was like an accelerating ice skater pulled around her partner in a tight twirl – or like a fish caught in a superstrong whirlpool. Something extreme had to be in the middle of each of those galaxies. You might be able to guess what this was, but for scientists, the best answer came as a shock. In 1994 telescopic evidence confirmed the amazing cause: a supermassive black hole, with the mass not of one imploded star, not of two, but of millions – maybe even billions.

—A Black Hole Is NOT a Hole,
Carolyn Cinami DeCristofano

Which connection helps the reader understand how supermassive black holes were found?

careening stars and orbits
astronomers and telescopic evidence
fish and whirlpools

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Astronomers found stars careening around these centers, zooming at previously unheard-of speeds in...

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