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dim matter

Scientific  

  1. Matter that is presumed to exist because of the gravitational effect it has on other matter but that is difficult to observe directly because of its very low luminosity.

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A more intriguing, if speculative, suggestion involves what might be called cold dim matter.

From New York Times

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.