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time

Mathematics

The mathematician who worked out how to time travel

Mathematics suggested that time travel is physically possible – and Kurt G?del proved it. Mathematician Karl Sigmund explains how the polymath did it

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Physics

Most accurate clock ever can tick for 40 billion years without error

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Physics

How one theory ties together everything we know about the universe

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Person writing math equations on glass

Mathematics

Why science relies too much on mathematics

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Theory of everything and geometry

Physics

Why physicists are rethinking the route to a theory of everything

Features

Gilt-metal zimingzhong

Video

See antique clockwork marvels from China's Forbidden City

Video

18_????????? European-style zimingzhong ? The Palace Museum

Comment

Antique clocks give a window into scientific innovation of times past

Regulars

Martin Rees - Astronomer Royal

Space

'This century is special': Martin Rees on the vast span of time

Comment

A still from the movie Interstellar, which explores themes of time travel.

Video

5 must-see time travel movies reviewed by a metaphysicist

Video

High resolution images presents creating planets of the solar system. This image elements furnished by NASA.

Space

This mathematical trick can help you imagine space-time

Visualising space-time can be a mind-melting exercise, but mathematician Manil Suri has a trick that makes it easier

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Physics

Why I've been somewhat obsessed with space-time this year

Comment

Physics

Physicists find ultimate limit for how accurate clocks can be

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Mind

Time seems to slow down when you're high – why does that happen?

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Physics

Why the quantum universe is weirder than you think

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