One of the mysteries of the English language finally explained.
(in some cosmological theories) nonluminous material that is postulated to exist in space and that could take any of several forms including weakly interacting particles (cold dark matter) or high-energy randomly moving particles created soon after the Big Bang (hot dark matter).
- ‘Identification of the different energetic particles, including dark matter, is done by pulse shape discrimination.’
- ‘Orbital analysis can give astronomers valuable clues about the amount and distribution of dark matter in the galaxies.’
- ‘The existence of such massive clusters in the early Universe agrees with a cosmological model in which clusters form in a merge of many sub-clusters in a Universe dominated by cold dark matter.’
- ‘Most astronomers believe that dark matter exists - even though it has never been seen, and no one knows what it might be.’
- ‘So far the most promising candidate for dark matter is the neutralino, because they interact weakly.’
- ‘It is most likely that particle physicists will find dark matter, if indeed it exists in particle form.’
- ‘Nobody knows what dark matter is, but observers knew there is five times as much dark matter as visible matter.’
- ‘Among the many mysteries in the universe is the dark matter in galaxies and clusters.’
- ‘The substance known as dark matter seems to create ghost galaxies that mirror the ones we can see, astrophysicists said Wednesday.’
- ‘Galaxies are composed of billions to trillions of stars, as well as gas, dust, and dark matter, all bound together by gravity.’
- ‘Most galaxies have more of the mysterious dark matter than ordinary, visible matter.’
- ‘The Collisionless Boltzmann Equation defines a galaxy as a self-gravitating system of stars and particles of dark matter.’
- ‘Ordinary matter and dark matter loosely track each other in space, but not in a one-to-one ratio.’
- ‘Physicists say that most of the universe consists of dark matter.’
- ‘Theory predicts that there is five times more dark matter than ordinary matter in the universe.’
- ‘According to most theories of dark matter, it is too energetic to have been created by the annihilation of dark matter particles.’
- ‘If the infall of the ordinary matter were not stopped, there would be no visible galaxies, only black holes surrounded by dark matter.’
- ‘The ratio of dark matter to ordinary matter is expressed as a ratio of nuclear binding energies and predicted to be about 5.’
- ‘For years, ancient humans knew of the existence of dark matter in the universe but could not explain its presence or what it did.’
- ‘According to cosmological theory, soon after the Big Bang, cold dark matter formed the universe's first large-scale structures, which then collapsed under their own weight to form vast halos.’
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