Instead, dark matter is its own antimatter, so any pair of particles that meet will destroy each other.
For one thing, it sounds like it has to do “dark matter,” but they are almost complete opposites.
Nearly everything we know about dark matter so far comes from astronomy.
Like dark matter, dark money in politics has partly been a matter of faith, evidence of things unseen.
Not only that, they are a rich environment for galaxies, hot plasma, and dark matter.
In a dark matter like this, where we know so little, it behoves us to provide for every chance.
It is a dark letter: but about a dark matter and a dark man.
In the meantime, I shall keep my eye on the district, and let no opportunity of throwing light upon this dark matter pass me.
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."
Showing a great projection of "dark matter" cutting off the light from behind.
|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.
Our Living Language : What is the universe made of? We know that galaxies consist of planets, stars, and huge gas and dust clouds—all of these objects are observable by the radiation they give off, such as radio, infrared, optical, ultraviolet, x-ray, or gamma-ray radiation, and all can be observed using various kinds of telescopes. But there are reasons to suspect the existence of far more matter than this, matter that is not directly observable. Evidence for such dark matter comes from observations of certain gravitational effects. For example, astronomers have found that galaxies rotate much faster than they would be expected to rotate based solely on their observable mass—in fact, they should be flying apart. One explanation for this apparent anomaly is to assume that the galaxies have much more mass than we can see, and this invisible mass holds them together gravitationally. Various theories of the composition of this invisible dark matter have been proposed, from exotic yet-to-be discovered particles to planet-sized objects made of ordinary matter that are too small or far away to be detected by present-day instruments. But none of these theories are entirely satisfactory, and the fundamental question of what makes up most of the universe remains unanswered.
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.