Cutting spacetime into patches could help explain the size of the universe—and provide the first ”experimental” evidence that string theory is on the right track.

Traditionally, observers play no special role in physics. Like bird watchers in a perfect hide, we observe the outcome of experiments, or gaze at the stars through our telescopes, taking no part in the action. Modern physics, however, tells a different story ... find out more with these articles and videos.

Can the very act of observing something change what's being observed? This series of articles and videos explores some basic questions about the role of the observers in physics.

If there's a multiverse, then how many of its component universes are like our own?

If there's a multiverse, then how many of its component universes are like our own?

What do we know about our Universe? And could there be more than one?

To celebrate the release of more English translations of Einstein's papers, we revisit one of his previously unknown models of the Universe.

If you like to have your mind blown cosmology is a great field to go into. But is it science?

George Ellis explains why the study of the cosmos poses some very deep questions.

The Astronomer Royal examines the evolution of our Universe and the important role of the constants of nature in this filmed public talk.

Yesterday cosmologists at the University of Cambridge delivered their verdict on a major breakthrough that rocked science this week: the announcement of the BICEP2 project of direct evidence for an inflationary theory of the Universe and the existence of gravity waves

How big is the Universe? Where did it come from and where is it going? Why is it the way it is? These are just some of the questions cosmologists study.