A backward, mirror universe could explain the existence of dark matter. If an anti-universe exists, it would run backward in ...

Extraordinary claims require extraordinary evidence,” Carl Sagan once warned a maxim now resonating through telescopes worldwide as astronomers grapple with a mind-bending new discovery. The James ...

In one new theory, it is possible that dark matter exists in a mirror universe where there are only dark versions of forces ...

A new theoretical study proposes a radical idea in the search for dark matter—using the surface of Ganymede, Jupiter’s ...

The immensity of space makes it impossible for humans to discover every hiding place the universe holds. Its infinitude makes ...

Dark matter is one of the biggest puzzles in science. Although it makes up about 85 percent of all matter in the universe, it ...

NASA's James Webb Space Telescope has potentially identified 300 ancient objects, possibly early galaxies formed shortly ...

The new measurement from LHCb has found differences between baryons and antibaryons, which are made of three quarks and three ...

That cosmologists cannot agree on one of the most elementary facts about the universe is striking enough. But that ...

The universe is a very intriguing and still mysterious thing. And pinning down exactly what dark energy is, and how it behaves, is going to be paramount to understanding how the universe might end.

The first chemical reactions in the wake of the Big Bang have been recreated for the first time in conditions similar to ...

For decades, astronomers have been trying to nail down the value of the Hubble constant—a measure of how fast the universe is expanding. But some cosmologists say there’s evidence that the universe is ...