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.

Mar 18, 2025 · At the first dark matter conference I attended after graduate school, I took a bet with a primary proponent of the “dark matter haze” idea, Dan Hooper of the University of Wisconsin–Madison.

Feb 19, 2025 · 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).

5 days ago · While dark energy is weakening, according to Ishak, matter is not. Weak dark energy could strengthen matter, which eventually could be the force that causes the universe to collapse on itself, he ...

Sep 26, 2024 · For decades, scientists assumed that dark matter and regular matter only interacted through gravity, making it almost impossible to detect dark matter directly. But now, this breakthrough could be the missing link we’ve been searching for in the cosmic puzzle.

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.

2 days ago · Breaking down ΛCDM, CDM stands for Cold Dark Matter, and Λ is the cosmological constant that represents the effects of dark energy. If this finding is confirmed, the Λ in ΛCDM would be no more ...

6 days ago · In isolation, DESI’s 15 million galaxies could match either an evolving dark energy model or the standard theory of cosmology, known as the Lambda-CDM model, which assumes a cosmological constant. (Lambda is the Greek symbol used for Einstein’s cosmological constant, and CDM stands for cold dark matter.)

Mar 4, 2025 · Dark Matter Learn how dark matter is detectable through its gravitational effects. Despite its elusive nature, dark matter is a crucial component of the cosmos. Because it is electromagnetically neutral, dark matter does not interact with light and …

The current theory, called Lambda-cold dark matter (or Lambda-CDM), favors a new type of particle for dark matter that, unlike neutrinos, moves slowly enough to coalesce and form galactic halos. This particle is often called a ‘WIMP’, for Weakly Interacting Massive Particle.