Is dark matter real, or have we misunderstood gravity? - Phys.org
2021年6月22日 · New research, published in Astronomy & Astrophysics this week, pushes the limits of dark matter observations to the unknown outer regions of galaxies, and in doing so re-evaluates several...
Is Dark Matter Real? - Scientific American
2018年8月1日 · For many decades the most popular hypothesis has been that dark matter is composed of new, so far undetected particles that do not interact with light. The alternative explanation that we have...
Dark matter - Wikipedia
In astronomy, dark matter is a hypothetical form of matter that does not interact with light or other electromagnetic radiation. Dark matter is implied by gravitational effects which cannot be explained by general relativity unless more matter is present than can be observed.
Dark Matter & Dark Energy - Science@NASA
Discover the universe's building blocks – matter, dark matter, and dark energy. Everything scientists can observe in the universe, from people to planets, is made of matter. Matter is defined as any substance that has mass and occupies space. But there’s more to the universe than the matter we can see.
Dark matter - CERN
Dark matter seems to outweigh visible matter roughly six to one, making up about 27% of the universe. Here's a sobering fact: The matter we know and that makes up all stars and galaxies only accounts for 5% of the content of the universe! But what is dark matter? One idea is that it could contain "supersymmetric particles" – hypothesized ...
Dark matter is real - Nature Physics
2006年10月1日 · It's hard to decide whether cosmologists' belief in the existence of dark matter represents hubris or humility. Is it overly bold to believe in a substance we've never directly seen? Or is it...
Dark Matter - NASA Science
The mission will measure the locations and quantities of both normal matter and dark matter in hundreds of millions of galaxies. Throughout cosmic history, dark matter has driven how stars and galaxies formed and evolved.
Is dark matter theory or fact? - Scientific American
1998年6月15日 · Dark matter does not reveal its presence by emitting any type of electromagnetic radiation. It emits no infrared radiation, nor does it give off radio waves, ultraviolet radiation, X-rays or...
Dark matter | Definition, Discovery, Distribution, & Facts - Britannica
2024年12月18日 · 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).
Is Dark Matter Real? - Live Science
2017年7月16日 · While many people take the existence of dark matter for granted, it's still a theory that has yet to be proven. But new evidence could bolster support for dark matter theories.