Physics
You can turn any random sequence of events into a clock
A set of mathematical equations can help turn apparently random observations into a clock – and then measure its accuracy
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Space
Time ticks faster on the moon by 57 microseconds per Earth day
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Physics
How physics is helping us to explain why time always moves forwards
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Physics
How materials that rewind light can test physics’ most extreme ideas
Features
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’
Features
Physics
Quantum ‘arrow of time’ suggests early universe had no entanglement
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Mathematics
The mathematician who worked out how to time travel
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Physics
Most accurate clock ever can tick for 40 billion years without error
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Technology
See antique clockwork marvels from China’s Forbidden City
These lavish zimingzhong clocks don't just represent time but serve as windows on a period of cutting-edge scientific innovation
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Comment
Antique clocks give a window into scientific innovation of times past
Regulars
Space
‘This century is special’: Martin Rees on the vast span of time
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Physics
5 must-see time travel movies reviewed by a metaphysicist
Video
Physics
Physicists find ultimate limit for how accurate clocks can be
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