Scientists have many big questions to tackle about the universe, including how big it actually is. But even the proposed answers aren't straightforward.

Knotted structures once imagined by Lord Kelvin may actually have shaped the universe’s earliest moments, according to new ...

The James Webb Space Telescope isn’t just taking pictures — it’s time-traveling with light. In this video, we follow its ...

If you look across space with a telescope, you'll see countless galaxies, most of which host large central black holes, ...

If you look across space with a telescope, you’ll see countless galaxies, most of which host large central black holes, billions of stars and their attendant planets. The universe teems with huge, ...

It’s always amazing, and more than a little humbling, when the universe reminds us that our “common sense” is provincial, ...

The observable universe is 93 billion light-years wide — but what’s beyond it? Astronomers have found strange patterns in the cosmic background radiation that suggest something massive and unseen ...

Mathematical quirks of our universe have led some cosmologists to wonder whether the cosmos was actually born in a black hole. Parallels in the physics of the universe and that of black holes have led ...

Hundreds of billions of galaxies are estimated to exist in the universe, each an island of stars, gas, and dust with dark matter in the vast cosmic expanse, each one unique. It is this diversity that ...

According to the standard cosmological model, the Universe has been in a phase of accelerated expansion for several billion years—an expansion expected to continue forever, leading to a colder, ...