In astronomy, dark matter is an invisible and 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.

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).

2024年5月8日 · Dark matter and dark energy are mysterious substances that affect and shape the cosmos, and scientists are still trying to figure them out. While normal matter is everywhere in our daily lives, it composes less than 5% of the total universe.

Dark matter makes up most of the mass of galaxies and galaxy clusters, and is responsible for the way galaxies are organized on grand scales. Dark energy, meanwhile, is the name we give the mysterious influence driving the accelerated expansion of the universe.

Dark matter candidates arise frequently in theories that suggest physics beyond the Standard Model, such as supersymmetry and extra dimensions. One theory suggests the existence of a “Hidden Valley”, a parallel world made of dark matter having very little in …

2024年12月3日 · Using NASA’s Hubble Space Telescope and a new observing technique, astronomers have found that dark matter forms much smaller clumps than previously known. This result confirms one of the fundamental predictions of …

Modern astrophysics and particle physics theory suggests that dark matter exists in the form of an as yet undiscovered elementary particle. Dark matter is pervasive throughout the Universe, so it’s no surprise that dark matter is also prevalent on Earth.

6 天之前 · Dark-matter research spans a very broad range of topics and methods. This makes it a challenging research field to enter and master. Dark Matter: Evidence, Theory and Constraints by David Marsh, David Ellis and Viraf Mehta, the latest addition to the Princeton Series in Astrophysics, clearly presents the relevant essentials of all of these areas.

2024年8月6日 · Dark matter is entirely invisible, emitting no light or energy, making it undetectable by conventional sensors and detectors. Scientists believe that the key to its elusive nature lies in its...

2018年5月9日 · Physicists and astronomers have determined that most of the material in the universe is “dark matter”—whose existence we infer from its gravitational effects but not through electromagnetic...