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A hypothetical type of supermassive star once proposed as the power source of quasars. They were envisaged as having a mass of about 100 million solar masses, to spin rapidly, and to radiate like a scaled-up version of a pulsar. However, even if such an object could form, it would be unstable and would rapidly collapse into a supermassive black hole.

Subjects: Astronomy and Astrophysics.

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