Radio waves from black holes in some young galaxies change rapidly

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An artist’s impression of a young active galaxy with a black hole at its centre

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Some young galaxies with black holes in their centre change their emissions of radio waves far faster than astronomers thought possible. This means it might be easier to spot a type of galaxy known as a blazar.

Kathryn Ross at the International Centre for Radio Astronomy Research in Perth, Australia, and her colleagues surveyed more than 21,000 radio-emitting galaxies under 100,000 years old with a black hole at their core. They found 123 that …

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