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What is dark matter?

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FROM THE February 2007 ISSUE

What is dark matter?

Jack Kessler, El Cerrito, California

Published: Thursday, February 01, 2007

No one knows for sure. Dark matter was proposed by Swiss-American astronomer Fritz Zwicky (1898-1974) in 1933 to explain why the Coma galaxy cluster appeared to have a stronger gravitational field than expected if it were composed of matter that interacts with light.

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