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en.wikipedia.org/wiki/Dark_matter

Dark matter is a hypothetical form of matter that is thought to account for approximately 85% of the matter in the universe and about a quarter of its total energy density. The majority of dark matter is thought to be non-baryonic in nature, possibly being composed of some as-yet undiscovered subatomic particles.

www.britannica.com/science/dark-matter

Two varieties of dark matter have been found to exist. The first variety is about 4.5 percent of the universe and is made of the familiar baryons (i.e., protons, neutrons, and atomic nuclei), which also make up the luminous stars and galaxies. Most of this baryonic dark matter is expected to exist in the form of gas in and between the galaxies.

www.newscientist.com/article/2149742-half-the-universes...

The missing links between galaxies have finally been found. This is the first detection of the roughly half of the normal matter in our universe – protons, neutrons and electrons – unaccounted ...

www.forbes.com/sites/startswithabang/2018/06/25/we-just...

By examining stars, dust, and gas in galaxies and clusters, scientists had found only 18% of the normal matter. But by surveying intergalactic space, including along filaments and in cosmic voids ...

science.nasa.gov/astrophysics/focus-areas/what-is-dark-energy

What is dark energy? More is unknown than is known — we know how much there is, and we know some of its properties; other than that, dark energy is a mystery — but an important one. Roughly 70% of the Universe is made of dark energy. Dark matter makes up about 25%. The rest - everything on Earth, everything ever observed with all of our instruments, all normal matter adds up to less than 5 ...

www.forbes.com/sites/startswithabang/2017/10/10/missing...

Missing Matter Found, But Doesn't Dent Dark Matter. Ethan Siegel Senior Contributor Starts With A Bang Contributor Group Opinions expressed by Forbes Contributors are their own. Science ...

www.space.com/23879-dark-matter-detection-discovery.html

The search for invisible dark matter that makes up most of the universe could be over. See how clues from a new study suggest that evidence of the long-sought, yet elusive, dark matter may have ...

www.sciencealert.com/physicists-say-we-might-have-found...

dark matter. Dark matter is estimated to make up around 26 percent of the mass and energy in the observable universe. But although we can detect the gravitational force this mysterious type of matter is exerting, it doesn't seem to put out any form of light or radiation that we can pick up - hence the 'dark'.

www.livescience.com/62151-galaxy-dark-matter-physics.html

In that study, the researchers found an object that could exist in a universe that has dark matter, but that would be nearly unimaginable in a MOND universe: a totally normal galaxy, one that ...

www.space.com/20930-dark-matter.html

Dark matter emits no light, and cannot be directly observed, but scientists think that it and dark energy make up most of the mass of the universe. ... Instead, they found the stars in both ...