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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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Fireball in South Carolina. Screenshot from Facebook video posted by Kathryn Rose Farr on 26 Jun 2025

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Mystery fireball spotted plummeting to Earth over the US

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Vera C. Rubin Observatory

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Look inside the revolutionary Vera C. Rubin Observatory

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Trees against starry sky

Space

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

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In about 1.3 million years, the star system Gliese 710 is set to pass directly through our Oort Cloud, an event visualized in a dramatic scene in Encounters in the Milky Way. During its flyby, our systems will swap icy comets, flinging some out on new paths.

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�鶹��ý recommends a new space show at the Hayden Planetarium

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Rubin Observatory in March 2024...***..Observatorio Rubin en marzo de 2024.

Space

Why you should join a watch party for the first Vera C. Rubin images

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Astronaut Scott Kelly posted this photo of an aurora taken from the International Space Station to Twitter on August 15, 2015

Physics

The radical idea that space-time remembers could upend cosmology

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Astronaut Sally Ride, mission specialist on STS-7, monitors control panels from the pilot's chair on the Flight Deck. Floating in front of her is a flight procedures notebook. (Credit: NASA)

Space

Life of first US woman in space Sally Ride makes a moving documentary

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The eye is first drawn, in this new NASA/ESA/CSA James Webb Space Telescope Picture of the Month, to the central mega-monster that is galaxy cluster Abell S1063. This behemoth collection of galaxies, lying 4.5 billion light-years from Earth in the constellation Grus (the Crane), dominates the scene. Looking more closely, this dense collection of heavy galaxies is surrounded by glowing streaks of light, and these warped arcs are the true object of scientists??? interest: faint galaxies from the Universe???s distant past. Abell S1063 was previously observed by the NASA/ESA Hubble Space Telescope???s Frontier Fields programme. It is a strong gravitational lens: the galaxy cluster is so massive that the light of distant galaxies aligned behind it is bent around it, creating the warped arcs that we see here. Like a glass lens, it focuses the light from these faraway galaxies. The resulting images, albeit distorted, are both bright and magnified ??? enough to be observed and studied. This was the aim of Hubble???s observations, using the galaxy cluster as a magnifying glass to investigate the early Universe. The new imagery from Webb???s Near-Infrared Camera (NIRCam) takes this quest even further back in time. This image showcases an incredible forest of lensing arcs around Abell S1063, which reveal distorted background galaxies at a range of cosmic distances, along with a multitude of faint galaxies and previously unseen features. This image is what???s known as a deep field ??? a long exposure of a single area of the sky, collecting as much light as possible to draw out the most faint and distant galaxies that don???t appear in ordinary images. With 9 separate snapshots of different near-infrared wavelengths of light, totalling around 120 hours of observing time and aided by the magnifying effect of gravitational lensing, this is Webb???s deepest gaze on a single target to date. Focusing such observing power on a massive gravitational lens, like Abell S1063, therefore h

Space

Peer into the early universe as light bends around huge galaxy cluster

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Space

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

The Hubble constant, a set number that connects a galaxy’s speed to its distance from Earth and tells us how fast the universe is expanding, was first described more than a hundred years ago – but astronomers have debated it ever since

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Our verdict on Ringworld by Larry Niven: Nice maths, shame about Teela

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Technology

Trump's Golden Dome defence project could spur a space arms race

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Technology

See the robot that may one day search for life on Jupiter's icy moon

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Space

A doe-eyed look at space exploration is inadequate for the zeitgeist

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