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Space

The first quantum fluctuations set into motion a huge cosmic mystery

The earliest acoustic vibrations in the cosmos weren’t exactly sound – they travelled at half the speed of light and there was nobody around to hear them anyway. But Jim Baggott says from the first moments, the universe was singing

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3D6BBB4 Comet Lemmon photographed from northern Italy on 26th October 2025.

Space

Comets were on fire this year – for better or worse

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Are we living in a simulation? This experiment could tell us

Physics

Are we living in a simulation? This experiment could tell us

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Space

A distant galaxy is being strangled by the cosmic web

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Space

Is the expansion of the universe slowing down?

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CMB-S4 will use telescopes installed at the South Pole to measure variations in the temperature and polarization of microwave light across most of the sky to probe for ripples in space-time. Shown here is the South Pole Telescope. Photo: Brad Benson, University of Chicago, Fermilab

Space

The end of US support for the CMB-S4 telescope is devastating

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The 30-year fight over how many numbers we need to describe reality

Physics

The 30-year fight over how many numbers we need to describe reality

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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

Space

We’ve discovered the most massive black hole yet

A galaxy billions of light years from Earth houses what may be the most massive black hole in the universe, equivalent to cramming the full mass of a small galaxy into a single object

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Physics

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

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Physics

Laws of quantum physics may rule out a universe that came before ours

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Mathematics

Why physicists think geometry is the path to a theory of everything

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Space

Why are the physical constants of the universe so perfect for life?

Features