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General relativity

Physics

Jim Al-Khalili: Everything you need to know about time

From manifest time to the quantum arrow of time and time travel, Jim Al-Khalili explores one of the biggest unsolved problems in modern physics

Video

Physics

Random wobbles in time could finally solve gravity鈥檚 greatest mystery

News

Space

Do black holes exist and, if not, what have we really been looking at?

Features
2G4A579 3D visualization of gravity distorsion, physical objects in orbit, space, general theory of relativity, law of universal gravitation, scientific

Physics

Why I still love reckoning with the quantum gravity problem

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Physics

The wild physics that could actually be used to build a time machine

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Space

Einstein鈥檚 theories tested on the largest scale ever 鈥� he was right

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Simulation of a black hole

Space

What does it mean to 鈥渓ook鈥� at a black hole?

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This photograph shows the Submillimeter Telescope (SMT) at the Arizona Radio Observatory, at an altitude of 3100 metres on Mount Graham in Arizona, USA. https://www.eso.org/public/unitedkingdom/images/eso1229d/?lang

Space

The physicist who wants to build a telescope bigger than Earth

Features

Physics

How a simple physics experiment could reveal the 鈥渄ark dimension鈥�

Features

Space

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

With lunar exploration ramping up, NASA has been tasked with defining a time zone for the moon. New calculations show that time is ever so slightly faster on the lunar surface, which can affect navigation

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Space

Einstein’s theory was wrong about black holes made out of light

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Space

Einstein was right about the way matter plunges into black holes

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Space

We are about to hear echoes in the fabric of space for the first time

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Space

We live in a cosmic void so empty that it breaks the laws of cosmology

Features