Content about “
general relativity
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Article
hourglass with clock behind

What is time?

Everyone knows what time is. We can practically feel it ticking away, marching on in the same direction with horrifying regularity. Time has enslaved the Western world and become our most precious commodity. Turn it over to the physicists however, and it begins to morph, twist and even crumble away. So what is time exactly?
Podcast

What is time: The podcast

This podcast featuring Paul Davies, a theoretical physicist and cosmologist at Arizona State University and Director of BEYOND: Centre for Fundamental Concepts in Science, explores this difficult question and accompanies our What is time article.
Article

Dark stars

Gravitational waves have provided a wealth of information about black holes. But could other objects be hiding in this data too? Researchers are exploring this idea, which may also help resolve the mystery of dark matter.

Article
simulation

Boson stars: Beyond vanilla

Physicists have figured out how we might detect hypothetical boson stars. If we do, then this would count as a major step towards solving the riddle of dark matter,

Article

The holographic principle

Over the last few decades physicists have been developing a curious idea. Perhaps the world we inhabit is a hologram, lacking a crucial feature of the world as we perceive it: the third dimension.
News story
black hole

Black holes win Nobel Prize

Roger Penrose, Reinhard Genzel and Andrea Ghez win the 2020 Nobel Prize in Physics for their work on black holes.
Article

Our changing picture of gravity

To celebrate the recent centenary of the first major test of Einstein's general theory of relativity, we look back over how our picture of gravity has changed.
Article
David Berman

A geometry for strings

If, as string theory suggests, the world is made of strings, then what does that mean for a geometry of points? Find out more in this video.

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