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What is dark matter in physics?
Does dark matter interact with normal matter?
Does dark matter outweigh visible matter?
Is dark matter a real thing?
Jan 6, 2021 · Jan. 6, 2021, 7:24 AM PST. By Tom Metcalfe. For decades, astronomers, physicists and cosmologists have theorized that the universe is filled with an exotic material called "dark matter" that ...
May 4, 2023 · Scientists know that dark matter is distinct from ordinary baryonic matter because whatever particles dark matter comprises either don't reflect, absorb or emit electromagnetic radiation or if...
In astronomy, dark matter is a hypothetical form of matter that appears not to interact with light or the electromagnetic field. Dark matter is implied by gravitational effects which cannot be explained by general relativity unless more matter is present than can be seen.
1 day ago · dark matter, a component of the universe whose presence is discerned from its gravitational attraction rather than its luminosity. Dark matter makes up 30.1 percent of the matter-energy composition of the universe; the rest is dark energy (69.4 percent) and “ordinary” visible matter (0.5 percent).
- Adam Riess
- What is dark matter?Dark matter is a component of the universe whose presence is discerned from its gravitational attraction rather than its luminosity.
- What percentage of the matter-energy composition of the universe is made of dark matter?Dark matter makes up 30.1 percent of the matter-energy composition of the universe. The rest is dark energy (69.4 percent) and “ordinary” visible m...
- Who first inferred the existence of dark matter?Dark matter’s existence was first inferred by Swiss American astronomer Fritz Zwicky, who in 1933 discovered that the mass of all the stars in the...
- What are the types of dark matter?Two varieties of dark matter have been found to exist. The first variety is about 4.5 percent of the universe and made of the familiar baryons (i.e...
Jan 28, 2022 · Bibliography. Dark matter makes up over 80% of all matter in the universe, but scientists have never seen it. We only assume it exists because, without it, the behavior of stars, planets and...
In fact, researchers have been able to infer the existence of dark matter only from the gravitational effect it seems to have on visible matter. Dark matter seems to outweigh visible matter roughly six to one, making up about 27% of the universe.
If dark matter is invisible, how do we know it exists? While dark matter doesn’t interact with normal matter in most cases, it does affect it gravitationally (which is how it was first discovered decades ago), so we can map its presence by looking at clusters of galaxies, the most massive structures in the universe.
