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  2. Dark matter - Wikipedia

    en.wikipedia.org/wiki/Dark_matter

    It is dark matter composed of constituents with an FSL much smaller than a protogalaxy. This is the focus for dark matter research, as hot dark matter does not seem capable of supporting galaxy or galaxy cluster formation, and most particle candidates slowed early. The constituents of cold dark matter are unknown.

  3. Dark energy - Wikipedia

    en.wikipedia.org/wiki/Dark_energy

    The Wilkinson Microwave Anisotropy Probe (WMAP) spacecraft seven-year analysis estimated a universe made up of 72.8% dark energy, 22.7% dark matter, and 4.5% ordinary matter. [4] Work done in 2013 based on the Planck spacecraft observations of the cosmic microwave background gave a more accurate estimate of 68.3% dark energy, 26.8% dark matter ...

  4. Orders of magnitude (energy) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(energy)

    Total mass–energy of our galaxy, the Milky Way, including dark matter and dark energy [342] [343] 1.4×10 59 J Mass-energy of the Andromeda galaxy (M31), ~0.8 trillion solar masses. [344] [345] 10 62 1–2×10 62 J: Total mass–energy of the Virgo Supercluster including dark matter, the Supercluster which contains the Milky Way [346] 10 70: ...

  5. Dark Matter May Not Be Invisible After All. This Discovery ...

    www.aol.com/dark-matter-may-not-invisible...

    Dark matter is called ‘dark’ because it’s invisible to us and does not measurably interact with anything other than gravity. It could be interspersed between the atoms that make up the Earth ...

  6. General relativity - Wikipedia

    en.wikipedia.org/wiki/General_relativity

    About 90% of all matter appears to be dark matter, which has mass (or, equivalently, gravitational influence), but does not interact electromagnetically and, hence, cannot be observed directly. [140] There is no generally accepted description of this new kind of matter, within the framework of known particle physics [ 141 ] or otherwise. [ 142 ]

  7. Cosmological constant - Wikipedia

    en.wikipedia.org/wiki/Cosmological_constant

    Estimated ratios of dark matter and dark energy (which may be the cosmological constant [1]) in the universe. According to current theories of physics, dark energy now dominates as the largest source of energy of the universe, in contrast to earlier epochs when it was insignificant.

  8. The 4 Percent Universe - Wikipedia

    en.wikipedia.org/wiki/The_4_Percent_Universe

    It is due to dark matter that galaxies are able to keep their shape, with the mass of dark matter creating enough gravitational force to hold the stars that make up a galaxy together. Dark energy, however, is a substance or force responsible for the accelerating expansion of the universe over time. [2]

  9. Scalar field dark matter - Wikipedia

    en.wikipedia.org/wiki/Scalar_field_dark_matter

    The dark matter can be modeled as a scalar field using two fitted parameters, mass and self-interaction. [4] [5] In this model the dark matter consists of an ultralight particle with a mass of ~10 −22 eV when there is no self-interaction.