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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

Originally known as the “missing mass,” dark matter’s existence was first inferred by Swiss American astronomer Fritz Zwicky, who in 1933 discovered that the mass of all the stars in the Coma cluster of galaxies provided only about 1 percent of the mass needed to keep the galaxies from escaping the cluster’s gravitational pull. The reality of this missing mass remained in question for ...

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 ...

newatlas.com/second-galaxy-no-dark-matter/59095

Some of the strongest evidence for dark matter to date has been discovered – and ironically, that's thanks to its absence. In a pair of studies published this week, astronomers have shed new ...

www.quora.com/How-was-dark-matter-discovered

Nitpick: dark matter has not been discovered. Astronomers are sure there's some matter out there that behaves unlike any matter we can produce or find on Earth, but nobody has discovered and brought home even a teeny, tiny piece of it. They call it "dark matter" because, perplexingly, it seems to be unable to emit radiation.

www.astronomy.com/news/2016/10/vera-rubin

How Vera Rubin confirmed dark matter . ... And while no one knows what all the dark matter is, scientists have discovered that some small fraction of it is made of neutrinos — tiny, fast-moving ...

www.sciencedaily.com/news/space_time/dark_matter

Dark Matter and Dark Energy. Read what astronomers are discovering about a gaping hole in the universe, how dark matter clumps contribute to galaxy formation and more. Space images.

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.astronomy.com/news/2019/03/ghostly-galaxy-without-dark-matter...

One year ago, astronomers were flabbergasted when they discovered a galaxy almost entirely devoid of dark matter. Now, one new study has verified the initial discovery, while a second study found ...

www.dailymail.co.uk/sciencetech/article-1236882/Dark...

Dark matter discovered: Scientists believe they have found elusive particle that makes up 90% of Universe. Most watched News videos. Hilarious moment little boy and sister shave head with electric ...