Dark matter | Definition, Discovery, Distribution, & Facts | Britannica
2024年11月1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).
Dark Matter & Dark Energy - Science@NASA
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 and dark energy are mysterious substances that affect and shape the cosmos, and scientists are still trying to figure them out.
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.
What Is Dark Matter? | NASA Space Place – NASA Science for Kids
2024年12月5日 · Dark matter is stuff in space that has gravity, but it is invisible and isn’t like anything else we know about. Dark matter makes up about 27% of the universe. Dark energy makes up roughly 68% of the universe. We don’t know much about dark energy either, but we do know there is a lot of it. Together, dark matter and dark energy make up ...
Dark Matter - Science@NASA
While dark matter doesn’t interact with normal matter in most cases, it does affect it gravitationally (which is how it was first discovered decades ago), so we can map its presence by looking at clusters of galaxies, the most massive structures in the universe.
What is dark matter? | Space
2024年8月6日 · Dark matter emits no light and can't be directly observed. Scientists believe it, along with dark energy, makes up most of the universe's mass.
Hubble Dark Matter - Science@NASA
We call this substance dark matter, an invisible form of matter that doesn’t emit, absorb or reflect light, or interact with normal matter. It’s theorized to make up 85 percent of the universe’s total mass, or almost 30 percent of the universe’s combined mass-energy.
Dark Energy and Dark Matter | Center for Astrophysics | Harvard ...
The rest is composed of dark matter and dark energy, which are invisible but dominate the structure and evolution of the 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.
How Dark Matter Could Be Measured in the Solar System
2022年2月1日 · Powerful observatories like the Hubble Space Telescope and the Chandra X-Ray Observatory have helped scientists begin to understand the influence and distribution of dark matter in the universe at large.
Dark matter - CERN
Dark energy makes up approximately 68% of the universe and appears to be associated with the vacuum in space. It is distributed evenly throughout the universe, not only in space but also in time – in other words, its effect is not diluted as the universe expands.