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  1. Dark matter

    Mysterious non-luminous matter (and/or radiation) comprising most of the matter in our observable universe

    In astronomy, dark matter is an invisible and hypothetical form of matter that does not interact with light or other electromagnetic radiation. Dark matter is implied by gravitational effects which cannot be explained by general relativity unless more matter is present than can be observed. Such effects occur in the context of formation and evolution of galaxies, gravitational lensing, the observable universe's current structure, mass position in galactic collisions, the motion of galaxies within galaxy clusters, and cosmic microwave background anisotropies. In the standard Lambda-CDM model of cosmology, the mass–energy content of the universe is 5% ordinary matter, 26.8% dark matter, and 68.2% a form of energy known as dark energy. Thus, dark matter constitutes 85% of the total mass, while dark energy and dark matter constitute 95% of the total mass–energy content. Wikipedia

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  2. britannica.com

    Dec 18, 2024dark 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," dark matter's existence was first inferred by ...
    Author:Adam Riess
  3. en.wikipedia.org

    Dark matter regularly appears as a topic in hybrid periodicals that cover both factual scientific topics and science fiction, [188] and dark matter itself has been referred to as "the stuff of science fiction". [189] Mention of dark matter is made in works of fiction. In such cases, it is usually attributed extraordinary physical or magical ...
  4. spaceplace.nasa.gov

    Jan 14, 2025This galaxy is right… Dark matter is pretty weird! Credit: NASA/JPL-Caltech. Just like dark energy, we don't know a whole lot about dark matter. But it seems that 27% of the universe, or about one quarter, is made up of the mysterious stuff. Together, dark energy and dark matter make up 95% of the universe. That's almost the whole universe!
  5. 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 ...
  6. science.nasa.gov

    The problem astronomers have is that most of the matter in the universe is not ordinary matter - it's a mysterious substance called dark matter. This image shows X-ray data from Chandra (blue) of the Perseus galaxy cluster, as well as Hubble (pink) optical data and radio (red) emission from the Very Large Array.
  7. sciencenotes.org

    Jun 21, 2023Dark matter is an invisible type of matter that exerts gravitational effects on light and regular matter. Dark matter is a hypothesized form of matter that does not interact with light or other forms of electromagnetic radiation, but exerts gravitational effects on visible matter, light, and the structure of the universe. Scientists calculate this elusive form of matter makes up approximately ...
  8. Researchers are also trying to create dark matter with particle accelerators, such as the Large Hadron Collider and various DOE Office of Science user facilities. Dark Matter Facts. Dark matter makes up about 85 percent of the total matter in the universe, accounting for more than five times as much as all ordinary matter.
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