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. Quick Facts In the 1970s, astronomer Vera Rubin confirmed the existence of dark matter by studying how individual galaxies rotated.

2023年6月21日 · Dark matter is a hypothesized form of matter that does not interact with light or other forms of electromagnetic radiation, but exerts gravitational effects on visible matter, light, and the structure of the universe.

Using fluctuations in the cosmic microwave background (CMB), astronomers determined that dark matter is about 27% of the contents of the universe, in terms of its overall contribution to the total mass and energy content of the cosmos. A timeline of the universe from the Big Bang at the left to modern times at the right.

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...

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?

2024年11月5日 · Dark matter is one of the universe’s most fascinating mysteries. Scientists believe it makes up about 27% of the universe, yet we can’t see or touch it. Unlike stars, planets, or any visible matter, dark matter doesn’t emit, absorb, …

2024年12月3日 · The invisible form of matter, called dark matter, makes up roughly 30% of the universe’s total mass. Its gravity drives normal matter (gas and dust) to collect and build up into stars, galaxies, and massive galaxy clusters.

2023年12月20日 · 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.