We find almost no quasars younger than about _____ billion years.

Name: We find almost no quasars younger than about _____ billion years.
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Quasars are powered by the accretion of matter onto supermassive black holes. The most massive black holes are found in the centers of the most massive galaxies. These galaxies are typically old, with ages of more than 10 billion years. Therefore, we find almost no quasars younger than about 10 billion years.

We Find Almost No Quasars Younger Than About _____ Billion