cosmology

Do the dramatic advances in cosmology in the last century herald a new golden age of philosophy? A new collaborative project between cosmologists and philosophers is leading the way.

Why does time only ever move in one direction? We talk to philosophers of physics Jeremy Butterfield and David Wallace, as well as the eminent Roger Penrose about the puzzle time poses to physicists and what it has to do with the Big Bang and the second law of thermodynamics.

When it comes to the entire cosmos, we humans are incredibly small and insignificant. But that's precisely why we need to take ourselves into account when thinking about the Universe. Find out why.

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.