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Physics

Why quantum mechanics says the past isn’t real

The famous double-slit experiment brings into question the very nature of matter. Its cousin, the quantum eraser experiment, makes us question the very existence of time – and how much we can manipulate it

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An artwork made my layering many paper cutouts, showing an astronaut near a black hole. Within the black hole are colourful swirls, stars and specks

Physics

Black hole entropy hints at a surprising truth about our universe

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Physics

The fascinating story of the ultimate cosmic law

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Physics

Ultracold atoms could test relativity in the quantum realm

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Space

Is the universe really one big black hole?

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

Space

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

Features

Physics

Ultracold clocks could reveal how quantum physics alters time

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Geometric 3d render shower of decorative starry short lines. Digital waterfall made futuristic straight shapes with random repetition. Tears outer space falling in rays bright stars.; Shutterstock ID 1952851798; purchase_order: -; job: -; client: -; other: -

Physics

Should it be space-time or spacetime – and why does it matter anyway?

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2H2KWEA Big Bang to Present. Stages in the history of the Universe after the Big Bang. At 300, 000 years, matter and radiation decouple, and the Universe becomes transparent for the first time. The first galaxies form at around 300 million years after the Big Bang, but the exact time period is uncertain. At an age of 9 billion years the Solar System formed. Finally, 13.7 billion years after the Big Bang we arrive at the present day. The Universe is still expanding and evolving.

Physics

What happens to light's energy when it redshifts? It's complicated

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Mathematics

These centuries-old equations predict flowing fluid – until they don’t

We use the Navier-Stokes equations every day, for applications from building rockets to designing drugs. But sometimes they break – and we don’t know why

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Physics

Is gravity a new type of force that arises from cosmic entropy?

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Physics

Where does time actually come from?

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Physics

The radical idea that space-time remembers could upend cosmology

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Physics

Microwaves seem to experience imaginary time – and now we know how

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