Supermassive black holes have a mass greater than a million suns – but their growth has slowed as the universe ages.

This article was originally published on Conversation. The magazine contributed the article to Space.com. Expert Voices: Opinion Articles and Insights. Fan Zhou He is a graduate student at Pennsylvania State University. W. Neil Brandt He is a professor of astronomy and astrophysics at Pennsylvania State University.

Black holes are fascinating astronomical objects with such strong gravity that nothing, not even light, can escape them. The most gigantic black holes, known as supermassive black holes, can weigh millions to billions of times the mass of the Sun.

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