Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun The difference between the observed mass of the universe and the larger mass required for gravity to halt the expansion of the universe.
- noun The unobserved matter required for the observed rotation of most galaxies to be consistent with their masses as inferred from luminous matter.
Etymologies
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Examples
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john commented on the word missing mass
“Dark matter became a serious issue in the 1970s, when Vera Rubin of the Carnegie Institution of Washington and her colleagues charted the rotation speeds of galaxies and found that they seemed to be enveloped in halos of dark matter, then called missing mass.”
The New York Times, At a Mine’s Bottom, Hints of Dark Matter, by Dennis Overbye, December 17, 2009
December 18, 2009
bilby commented on the word missing mass
The Vatican is investigating.
December 18, 2009
reesetee commented on the word missing mass
I remember that Sunday. I was very, very sick, see, and....
December 19, 2009