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Is there any way photons could contribute to the mysterious dark matter? | Astronomy.com

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Is there any way photons could contribute to the mysterious dark matter?

FROM THE September 2006 ISSUE

Is there any way photons could contribute to the mysterious dark matter?

JAMES BUTLER, LIBERTYVILLE, ILLINOIS

Published: Friday, September 01, 2006

Because photons mediate all electromagnetic interactions, limits on the mass of the photon are extremely strin-gent. Even a tiny mass would produce easily measurable effects.