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dark matter
noun
- a hypothetical form of matter invisible to electromagnetic radiation, postulated to account for gravitational forces observed in the universe.
dark matter
noun
- astronomy matter known to make up perhaps 90% of the mass of the universe, but not detectable by its absorption or emission of electromagnetic radiation
dark matter
- Matter that emits little or no detectable radiation. Gravitational forces observed on many astronomical objects suggest the significant presence of such matter in the universe, accounting for approximately 23 percent of the total mass and energy of the universe. Its exact nature is not well understood, but it may be largely composed of varieties of subatomic particles that have not yet been discovered, as well as the mass of black holes and of stars too dim to observe.
- Also called missing mass
dark matter
- Unseen matter that may make up more than ninety percent of the universe. As the name implies, dark matter does not interact with light or other electromagnetic radiation , so it cannot be seen directly, but it can be detected by measuring its gravitational effects. It is believed that dark matter was instrumental in forming galaxies early in the Big Bang .
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Word History and Origins
Origin of dark matter1
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A Closer Look
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Example Sentences
Instead, dark matter is its own antimatter, so any pair of particles that meet will destroy each other.
The Universe is filled with the mysterious invisible substance we call dark matter.
Nearly everything we know about dark matter so far comes from astronomy.
Not only that, they are a rich environment for galaxies, hot plasma, and dark matter.
For one thing, it sounds like it has to do “dark matter,” but they are almost complete opposites.
But how reconcile that with what we have said above on the absence of a noteworthy proportion of dark matter?
When I stooped over him he was in convulsions, and dark matter was oozing out of his mouth.
Showing a great projection of "dark matter" cutting off the light from behind.
Then she turned to Neville, and said, solemnly, "You wish to know the truth in this dark matter: for dark it is in very sooth."
In a dark matter like this, where we know so little, it behoves us to provide for every chance.
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