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Space-time

Physics

What “naked” singularities are revealing about quantum space-time

Are points of infinite curvature, where general relativity breaks down, always hidden inside black holes? An audacious attempt to find out is shedding light on the mystery of quantum gravity

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Physics

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

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Theory of everything and geometry

Physics

Why physicists are rethinking the route to a theory of everything

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

Physics

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

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Monika Schleier-Smith

Physics

The physicist trying to create space-time from scratch

Features

Physics

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

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S3F98G Colorful balloons against the light

Space

How the balloon analogy for an expanding universe is almost perfect

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Black hole. Abstract space wallpaper. Universe filled with stars; Shutterstock ID 2205005273; purchase_order: -; job: -; client: -; other: -

Physics

Bizarre portal-like 鈥榬ing wormholes鈥� could let you time travel

News
CE8NB6 Illustration showing galaxy giant whirlpool in space galaxy's effect on space image shows how gravity galaxy warps local

Physics

To create a wormhole that doesn’t collapse, you need exotic matter

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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

Space-time isn't expanding into anything because general relativity is what we call a background independent theory. Chanda Prescod-Weinstein sets out to explain what this means

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Physics

What does it mean when we say that space-time is expanding?

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Physics

What the thermodynamics of clocks tell us about the mysteries of time

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Physics

Why does time only move forwards? Possibly just because we鈥檙e ignorant

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Physics

Did time flow in two directions from the big bang, making two futures?

Features