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- Because dark matter does not emit, absorb, or reflect light, we mostly know it is there because of its gravitational pull on visible matter in space.
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May 6, 2024 · Credit: NASA/JPL-Caltech. If dark matter is invisible, how do we know it’s there? Because dark matter does not emit, absorb, or reflect light, we mostly know it is there because of its gravitational pull on visible matter in space.
Dark matter. Unlike normal matter, dark matter does not interact with the electromagnetic force. This means it does not absorb, reflect or emit light, making it extremely hard to spot. 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 ...
Dark matter does not bend light itself; mass (in this case the mass of the dark matter) bends spacetime. Light follows the curvature of spacetime, resulting in the lensing effect. [64] [65] In May 2021, a new detailed dark matter map was revealed by the Dark Energy Survey Collaboration. [66]
- 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
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-r...
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.May 9, 2018 · That is because dark matter carries five times the mass of ordinary matter and, furthermore, does not directly interact with light.
- Lisa Randall
- 2018
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...
5 days 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). Originally known as the “missing mass ...
