When we look for really distant objects, we can’t really see the Big Bang because the universe was so hot and dense that ...

The Universe began in a burst of light nearly 14 billion years ago, but as it expanded and cooled, darkness set in. Today, ...

The universe is too vast to track distances on the scale of miles, so astronomers use light-years to convey the great lengths ...

A compound lens forged by two galaxies is helping astronomers get a bead on the Hubble Constant and dark energy.

"Why do they have the same rotation? They must have a connection with each other — that would be a very strong question that ...

In the earliest moments of the Universe, the first photons were trapped in a sea of ionized gas. They scattered randomly with ...

What does dark energy have to do with proliferation of life in the universe? The answer is written in the stars, according to ...

More than 99% of Americans live under skies polluted by light. But dark skies at the Grand Canyon and more than 145 other ...

Gravity has shaped our cosmos. Its attractive influence turned tiny differences in the amount of matter present in the early ...

We are the Universe trying to understand itself. How, and why, did we come to be? Why does the Universe take the shape it ...

This, together with satellite measurements of the fraction of the universe’s first light, known as the Cosmic Microwave Background (CMB), that is scattered by electrons freed during reionization ...