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Physics

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

The record for the most accurate clock has been broken in an experiment with strontium atoms almost as cold as absolute zero, and it is twice as accurate as any predecessor

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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

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See antique clockwork marvels from China's Forbidden City

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

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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

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

Video

5 must-see time travel movies reviewed by a metaphysicist

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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

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TBTFJA star trail circle-space-night-sunset-blue

Physics

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

I have been revisiting the Unruh effect, a beautiful, strange concept that describes quantum field theory in curved-space time, says Chanda Prescod-Weinstein

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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 �C why does that happen?

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Physics

Why the quantum universe is weirder than you think

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Physics

The physicist trying to create space-time from scratch

Features