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general relativity

The international space station

Physics

Ultracold atoms in space will let us stress test Einstein's relativity

Potassium and rubidium atoms aboard the International Space Station have been cooled almost to absolute zero to put a fundamental principle of Einstein’s general theory of relativity to the ultimate test

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Is space-time quantum? Six ways to unpick the fabric of the universe

Physics

Is space-time quantum? Six ways to unpick the fabric of the universe

Features

Can recreating black holes in the lab solve the puzzles of space-time?

Physics

Can recreating black holes in the lab solve the puzzles of space-time?

Features

Quantum particles, quantum computer, galaxy-like ; Shutterstock ID 2194720327; purchase_order: -; job: -; client: -; other: -

Physics

How we could discover quantum gravity without rebuilding space-time

Features

Do we live in a hologram? Why physics is still mesmerised by this idea

Physics

Do we live in a hologram? Why physics is still mesmerised by this idea

Features

Will artificial intelligence ever discover new laws of physics?

Physics

Will artificial intelligence ever discover new laws of physics?

Features

Black holes

Space

Black holes wobbling three times a second have proved Einstein right

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CNES Satellite Illustration

Physics

Einstein's gravity principle still correct, finds most precise test

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Across the universe. Traveling in space. Time travel. Elements of this image furnished by NASA.; Shutterstock ID 200832383; purchase_order: -; job: -; client: -; other: -

Space

Why general relativity is known as a background independent theory

Comment

Illustration of a clock in a spiral

Physics

Time loops may not be forbidden by physics after all

Physicists find that causal loops, where two events separated in time influence each other in paradoxical ways, are allowed in many theoretical universes, some of which share features with our own

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Physics

Will we ever unite physics? Clocks in superposition could offer clues

Features

Physics

Hot plasma mirror may help solve Stephen Hawking’s black hole paradox

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Space

First picture of our galaxy’s supermassive black hole revealed

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Physics

Most precise atomic clock shows Einstein’s general relativity is right

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