The Big Bang may not have been the beginning ... density fluctuations that occurred during the universe's last contraction phase, not long before the period of expansion that we observe now.

The universe might have had a "secret life" before the Big Bang, a recent study has proposed. Prior to the Big Bang, researchers say black holes were created as a result of the universe ...

These theories aim to address questions the Big Bang does not fully resolve, keeping the debate about the universe’s origins alive and dynamic. Related: What happened before the Big Bang?

Like stretch marks left on skin that expanded too quickly or cracks embedded in freezing ice, cosmic strings are artifacts of what the universe looked like in the moments before it rapidly changed ...

In the Ophiuchus galaxy cluster, astronomers spotted the largest explosion in the universe consisting of energy equal to a ...

The universe expands...through what? Experts might have a suggestion. Expansion may be happening at a faster rate than ...

Astronomers have identified a quasar that may help explain how the universe’s “dark ages” finally ended. Astronomers have ...

"The Hubble tension is now a Hubble crisis." The mystery of the Hubble tension has deepened with the startling finding that ...

Early data of “little red dots,” or LRDs, from the James Webb Space Telescope (JWST) appeared to suggest the presence of ...

These are the same as the “universe-breaking” galaxies first ... in cosmic time — less than a billion years after the Big Bang. Scientists simply don’t understand how so many stars and ...

This is called the “heat death” of the Universe, but you can think of it instead as the death of heat. There will be no more differences in temperature anywhere, which means thermodynamics shuts down, ...