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missing mass

noun Astrophysics.
  1. the difference in mass in the universe between that observed to exist and that necessary for the closed universe model.
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Origin of missing mass

First recorded in 1975–80
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

missing mass in Science

missing mass

[mĭsĭng]
  1. See dark matter.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.