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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

Features

Physics

The fascinating story of the ultimate cosmic law

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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

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

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Chaotic streams of energy appear to slice through space

Physics

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

Features

Physics

Where does time actually come from?

The arrow of time can teach us more about how the universe began – and how it will end, says quantum columnist Karmela Padavic-Callaghan

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Physics

The radical idea that space-time remembers could upend cosmology

Features

Space

Why it's taking a century to pin down the speed of the universe

News

Physics

How dark energy findings may inspire a new generation of physics nerds

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Physics

Why physicists keep trying to get rid of space-time entirely

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