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

A new theory suggests that “time” might be the product of a universe that, long ago, decided to settle down into one ...

In most models of inflation, the early extreme burst of expansion which smoothed and flattened the universe also generated long-wavelength gravitational waves —ripples in the fabric of space-time.

Voracious black holes feeding on matter in the early universe display the curious spacetime phenomenon known as time dilation ...

How big is the universe? The question has been debated for centuries with no decision. Some theorists think that the universe is infinitely large, with galaxies extending forever into infinite ...

One result, they answer, will be the expansion of the universe. If the difference is only two parts in 1 billion billion, the galaxies will be forced to flee from one another.

Matter-antimatter asymmetry puzzles physicists. Learn how the Deep Underground Neutrino Experiment (DUNE) may find answers.