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- DictionaryDark mat·ter/ˌdärk ˈmadər/
noun
- 1. (in some cosmological theories) nonluminous material that is postulated to exist in space and that could take any of several forms including weakly interacting particles (cold dark matter) or high-energy randomly moving particles created soon after the Big Bang (hot dark matter).
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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.
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Dark matter is invisible. The effect of gravitational...
- Dark Matter (Disambiguation)
Dark•Matter, a role-playing game campaign setting; Dark...
- Dark Energy
In physical cosmology and astronomy, dark energy is an...
- Exotic Matter
There are several proposed types of exotic matter: ....
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- Primordial Black Hole
The dark matter problem, proposed in 1933 by Swiss-American...
- Fritz Zwicky
Fritz Zwicky (/ ˈ t s v ɪ k i /; [1] German:; February 14,...
- Soft Light
"Soft Light" is the twenty-third episode of the second...
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3 days ago · Dark matter is a component of the universe whose presence is discerned from its gravitational attraction rather than its luminosity. It makes up 30.1 percent of the matter-energy composition of the universe and has two varieties: baryonic and nonbaryonic.
- Adam Riess
- Dark matter is 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 m...
- 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...
- 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...
Aug 5, 2024 · Dark matter is that invisible glue that keeps stars, dust, and gas together in a galaxy. This mysterious substance makes up the majority of a galaxy's mass and forms the foundation of our Universe's structure. Dark matter is still one of the greatest mysteries of science. Credit: NASA/JPL-Caltech.
- Defining Dark Matter
- Properties of Dark Matter
- Dark Matter vs Ordinary Matter and Antimatter
- The Evidence For Dark Matter
- History
- Hypotheses About Dark Matter
- Dark Matter Detection Experiments
- References
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Dark matter is a hypothetical form of matter that does not absorb, reflect, or emit electromagnetic radiation. This makes it incredibly challenging to detect directly with current technology. It’s “dark” not because it’s black or absence of light but because it does not interact with light or any other form of electromagnetic radiation. In essence,...
While the specific characteristics of dark matter are still under investigation, scientists generally agree it possesses the following properties: 1. Non-Baryonic:Dark matter is not made of baryons, which are particles like protons and neutrons that comprise ordinary matter. 2. Non-Luminous:It does not emit, reflect or absorb light, or any other el...
Ordinary baryonic matter makes up everything we can see: stars, galaxies, planets, and even us. This matter consists of atoms, which are in turn made up of protons, neutrons, and electrons. Ordinary matter interacts with other matter through electromagnetic forces and absorbs, emits, or reflects light. We detect its presence using various technolog...
Though we can’t directly observe dark matter, we infer its existence through its gravitational effects. Here are the three primary lines of evidence: 1. Galactic Rotation Curves:According to the laws of physics, stars at the edges of a spinning galaxy should move slower than stars towards the center. However, observations show that stars at the edg...
The dark matter hypothesis traces its origins to a debate about the age of the Earth. In 1846, British physicist Lord Kelvin used the laws of thermodynamics to estimate Earth’s age. He determined that the Earth was between 20 to 100 million years old. This was significantly younger than the hundreds of millions to billions of years suggested by geo...
There are several competing theories about what dark matter could be: 1. Weakly Interacting Massive Particles (WIMPs):WIMPs are the most popular candidate. They are hypothetical particles that interact weakly with ordinary matter and are heavy enough to account for the observed effects of dark matter. 2. Axions:Axions are hypothetical particles tha...
Many experiments worldwide aim to detect and understand dark matter: 1. Direct Detection Experiments:These experiments, such as the XENON1T and the Large Underground Xenon experiment (LUX), try to detect the rare collisions between dark matter particles and ordinary matter. 2. Indirect Detection Experiments: These experiments, like the Fermi Gamma-...
Bergstrom, L. (2000). “Non-baryonic dark matter: Observational evidence and detection methods”. Reports on Progress in Physics. 63 (5): 793–841. doi:10.1088/0034-4885/63/5/2r3Bertone, G.; Hooper, D.; Silk, J. (2005). “Particle dark matter: Evidence, candidates and constraints”. Physics Reports. 405 (5–6): 279–390. doi:10.1016/j.physrep.2004.08.031Cho, Adrian (2017). “Is dark matter made of black holes?”. Science. doi:10.1126/science.aal0721Randall, Lisa (2015). Dark Matter and the Dinosaurs: The Astounding Interconnectedness of the Universe. New York: Ecco / Harper Collins Publishers. ISBN 978-0-06-232847-2.Dark matter is an invisible type of matter that exerts gravitational effects on light and regular matter. Learn about its properties, evidence, history, and hypotheses in this comprehensive article.
Matter is defined as any substance that has mass and occupies space. But there’s more to the universe than the matter we can see. Dark matter and dark energy are mysterious substances that affect and shape the cosmos, and scientists are still trying to figure them out.
Aug 6, 2024 · Dark matter emits no light and can't be directly observed. Scientists believe it, along with dark energy, makes up most of the universe's mass.
May 9, 2018 · Dark matter is any material that interacts with gravity but not with light. It is invisible to our eyes but critical to the formation of galaxies and the evolution of life. Learn about its nature, evidence and possible detection methods.
