Hubble Settles an Old Debate About Galaxies with Supermassive Black Holes

Posted on Categories Discover Magazine

Galaxies with central black holes can take various forms depending on the angle at which astronomers see them. (Credit: NASA)

Every large galaxy has a supermassive black hole at its center. And some of those black holes are actively ejecting huge amounts of high-energy light out into the cosmos.

Astronomers divide some of these active galaxies, which otherwise look like normal spirals, into two types, so-called Seyfert 1 and Seyfert 2 galaxies. Seyfert 1 galaxies have distinctive light

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