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space-time

Space

Astronomers may have glimpsed evidence of the biggest stars ever seen

The distant universe might be littered with supermassive stars between 1000 and 10,000 times the mass of the sun, which could solve a cosmic mystery about the origins of extremely large black holes

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The 19 best Christmas gifts for science lovers (and nerds)

Technology

The 19 best Christmas gifts for science lovers (and nerds)

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Physics

The fascinating story of the ultimate cosmic law

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Space

We may have found a surprisingly nearby cluster of primordial stars

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The best new science fiction books of November 2025

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The best new science fiction books of November 2025

Culture

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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Physics

Ultracold atoms could test relativity in the quantum realm

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Satellite-filled sky

Earth

How worried should we be about noxious chemicals from dead satellites?

Features

Once Upon a Time in Space book - James Bluemel Cosmonaut Valeriy Polyakov seen in Mir?s window from Shuttle Discovery STS063-711-080 (6 Feb. 1995) --- Cosmonaut Valeriy V. Polyakov, who boarded Russia's Mir Space Station on January 8, 1994, looks out Mir's window during rendezvous operations with the Space Shuttle Discovery. This is one of 16 still photographs released by the NASA Johnson Space Center (JSC) Public Affairs Office (PAO) on February 14, 1995. Onboard the Discovery were astronauts James D. Wetherbee, mission commander; Eileen M. Collins, pilot; Bernard A. Harris, Jr., payload commander; mission specialists C. Michael Foale, Janice E. Voss, and cosmonaut Vladimir G. Titov. Page 134

Space

See the beauty of space, captured by the astronauts who experienced it

Regulars

Space

Is the universe really one big black hole?

According to the equations that govern black holes, the larger one of these cosmic behemoths is the lower its average density – given that the universe contains a lot of relatively empty space, could the whole cosmos be a black hole?

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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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Space

How faster-than-light explosions could reveal the universe’s secrets

Features

Physics

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

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