Big big big black hole

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And then the black hole is the other component," said Jackie Faherty, an astrophysicist at the American Museum of Natural History in New York City, who wasn't involved in any of these papers. Originally published on Live Science. He said that after seeing the new papers he's "very skeptical" of the initial Nature paper's claim about the black hole's mass. They found it also showed a mild Doppler effect, suggesting its source was moving a little, and hinting that it likely came from the disk of material around an unseen black hole in the system. LB-1 has one very bright data source: All the light coming off the normal B star in the system. Telescopes on Earth generally aren't sharp enough to resolve the individual objects in star systems well enough to measure their movements — especially when one of those objects is a black hole, only visible from the thin "accretion disk" of material around its main body. Researchers can measure its movements using the Doppler effect, which makes light wavelengths lengthen and the light appear to redden as the star moves away from Earth, and then get a bit bluer as it moves back toward Earth. The difference between the black hole's slight wiggle and the star's rapid motion suggested the black hole was much larger — if they were closer to one another's size, you'd expect the black hole to move as much as the star.

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