Dark matter is a form of matter thought to account for approximately 85% of the matter in the universe and about a quarter of its total mass–energy density or about 2.241 × 10 −27 kg/m 3. Its presence is implied in a variety of astrophysical observations, including gravitational effects that cannot be explained by accepted theories of gravity unless more matter is present than can be seen.https://en.wikipedia.org/wiki/Dark_matter
Dark matter is a form of matter thought to account for approximately 85% of the matter in the universe and about a quarter of its total mass–energy density or about 2.241 × 10 −27 kg/m 3. Its presence is implied in a variety of astrophysical observations, including gravitational effects that cannot be explained by accepted theories of gravity unless more matter is present than can be seen.
We are much more certain what dark matter is not than we are what it is. First, it is dark, meaning that it is not in the form of stars and planets that we see. Observations show that there is far too little visible matter in the universe to make up the 27% required by the observations.
Sep 11, 2020 · This occurs when the gravity of dark matter in a galaxy cluster acts like a magnifying glass. It warps and magnifies the light of distant background galaxies beyond the cluster. Hubble Space ...
Sep 22, 2020 · Dark matter is a mysterious non-luminous substance making up the vast majority of matter in the universe. Though experts have observed the gravitational effects of dark matter for decades,...
Oct 13, 2020 · The more dark matter there is in a galaxy, the more gas it contains," suggests Johan H. Knapen, an IAC researcher and also a co-author of the article. make a difference: sponsored opportunity.
1 day ago · A recent study from the University of Melbourne proposes a new theory for the origin of dark matter, helping experimentalists in Australia and abroad in the search for the mysterious new matter.
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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).
2 days ago · Dark matter, the hidden stuff of our universe, is notoriously difficult to detect. In search of direct evidence, NIST researchers have proposed using a 3D array of pendulums as force detectors, which could detect the gravitational influence of passing dark matter particles.
Oct 14, 2020 · Scientists then examine the galaxy and tally up all of the matter we can detect directly (on all electromagnetic wavelengths) including stars, planets, nebulae etc. This is then subtracted from the initial figure implied by the gravitational lensing, and voila, the amount of dark matter in a given area is determined.
Feel-Good results for Dark Dark Matter
1 day ago · Except for Dragonfly 44, an otherwise-boring dwarf galaxy sitting in the Coma Cluster. In 2016, astronomers reported a surprising result from this galaxy: it was apparently made of 99.99% dark matter.