Accrete. One of the most beautiful images in modern astronomy is the accretion disk. Saturn’s rings are one example, but similar rings form around black holes. They capture millions of tiny bits of interstellar matter, which fall into orbit and form a disk that accumulates over time, that grows by adding new pieces—that accretes. On certain websites, your network of friends may accrete over time, as well—unless you have the personality of a black hole. Then they might disperse. Accrete: to grow by addition.

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