Big Bang Theory

We now have a better idea of how big black holes were born in the early universe, a new study reports.

Before the Big Bang, time may have run in reverse.

Back in the first moment of the universe, everything was hot and dense and in perfect balance. A new quantum experiment aims to show how that changed.

The emptiest space in the universe is full of gas.

If you're a fan of really big numbers that don't actually tell you much about the world, Clemson University astrophysicist Marco Ajello has a great one for you: 4 x 10^84.

The most luminous galaxy known appears to have devoured three smaller galaxies at the same time, revealing details about why it shone so brightly.

Astronomers think they have identified a star they believe to be about 13.5 billion years old, which would place its birth just after the Big Bang — and it's surprisingly close to us.

In 1980, physicist Alan Guth proposed a radical extension to the standard Big Bang model of the history of the universe, proposing a transformative event called cosmic inflation.

The "vanilla" Big Bang model, without any other additions or amendments, can't explain all the observations. Here's how it might have worked.

Is there room for God in the endless, expanding universe? In his final book, Stephen Hawking says no.

Scientists have ruled out black holes as a possible source for most of the elusive dark matter scattered throughout much of the universe.

We've known for about 20 years that the expansion of our universe is accelerating, but how does the dark energy that causes it work?

When stars explode, they generate light that you can see across the universe, and they hold a key to measuring how the universe grows.

A remarkable new image from the Hubble Space Telescope captures a close-up view of some of the most distant galaxies in the universe.

This week's "Ask A Spaceman" episode explores the radiation echo of the Big Bang that formed our universe. While we can't see it with our eyes, this radiation surrounds us everywhere.

A spacesuit worn on a mission seen by millions is up for auction.