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Physics

How Einstein was both right and wrong about gravitational waves

A century ago, Albert Einstein suggested that the universe might contain ripples in space-time, known as gravitational waves – but then he changed his mind

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Physics

Time travel sci-fi novel is a rip-roaringly good thought experiment

Culture

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Physics

You can turn any random sequence of events into a clock

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Mathematics

Is the universe a game?

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Space

Time ticks faster on the moon by 57 microseconds per Earth day

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2CE844B Infinity tunnel pocket watch time, time travel concept

Physics

How physics is helping us to explain why time always moves forwards

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Are space and time illusions? The answer could lie in black holes

Physics

Are space and time illusions? The answer could lie in black holes

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Physics

What "naked" singularities are revealing about quantum space-time

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Physics

How to wrap your mind around the real multiverse

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How materials that rewind light can test physics' most extreme ideas

Physics

How materials that rewind light can test physics' most extreme ideas

Strange solids called temporal metamaterials finally make it possible to investigate the controversial idea of quantum friction – and push special relativity to its limits

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Physics

Time may be an illusion created by quantum entanglement

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Physics

Quantum time travel: The experiment to 'send a particle into the past'

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Physics

Quantum 'arrow of time' suggests early universe had no entanglement

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Physics

How indefinite causality could lead us to a theory of quantum gravity

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