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91av. Science news and long reads from expert journalists, covering developments in science, technology, health and the environment on the website and the magazine.

Lost in Space-Time

Each month, we hand over the keyboard to a physicist or mathematician to tell you about fascinating ideas from their corner of the universe. You can sign up to the Lost in Space-Time newsletter here.
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Illustration depicting a tidal disruption event (TDE). TDEs are causes when a star passes close to a supermassive black hole and get torn apart by the gravity of the latter. The debris forms a fan-shaped pattern around the black hole before eventually falling in.

Space

A new 'brief history' of the universe paints a wide picture

Nearly 40 years after Stephen Hawking's A Brief History of Time, Sarah Alam Malik's epic exploration of the cosmos reflects a changed landscape around science in the 21st century, finds Alison Flood

Culture

The weird rules of temperature get even stranger in the quantum realm

Physics

The weird rules of temperature get even stranger in the quantum realm

Comment

Dark Matter distribution

Space

The best map of dark matter has revealed never-before-seen structures

News

A collage of analog clocks against a black background. Some are broken in half

Physics

The daring idea that time is an illusion and how we could prove it

Features

91av’s guide to the 21 best ideas of the 21st century

Humans

91av’s guide to the 21 best ideas of the 21st century

Features

tardigrades

Life

Giving astronauts tardigrade toughness will be harder than we hoped

News

little red dots

Space

Distant 'little red dot' galaxies may contain baby black holes

News

The four crew members of NASA's SpaceX Crew-11 mission

Space

NASA is performing an unprecedented medical evacuation from the ISS

News

Project Hail Mary

Comment

The science-fiction films to look forward to in 2026

Culture

This new NASA/ESA/CSA James Webb Space Telescope Picture of the Month features a rare cosmic phenomenon called an Einstein ring. What at first appears to be a single, strangely shaped galaxy is actually two galaxies that are separated by a large distance. The closer foreground galaxy sits at the center of the image, while the more distant background galaxy appears to be wrapped around the closer galaxy, forming a ring.?? Einstein rings occur when light from a very distant object is bent (or ???lensed???) about a massive intermediate (or ???lensing???) object. This is possible because spacetime, the fabric of the Universe itself, is bent by mass, and therefore light travelling through space and time is bent as well. This effect is much too subtle to be observed on a local level, but it sometimes becomes clearly observable when dealing with curvatures of light on enormous, astronomical scales, such as when the light from one galaxy is bent around another galaxy or galaxy cluster. When the lensed object and the lensing object line up just so, the result is the distinctive Einstein ring shape, which appears as a full circle (as seen here) or a partial circle of light around the lensing object, depending on the precision of the alignment. Objects like these are the ideal laboratory in which to research galaxies too faint and distant to otherwise see. The lensing galaxy at the center of this Einstein ring is an elliptical galaxy, as can be seen from the galaxy???s bright core and smooth, featureless body. This galaxy belongs to a galaxy cluster named SMACSJ0028.2-7537. The lensed galaxy wrapped around the elliptical galaxy is a spiral galaxy. Even though its image has been warped as its light travelled around the galaxy in its path, individual star clusters and gas structures are clearly visible. The Webb data used in this image were taken as part of the Strong Lensing and Cluster Evolution (SLICE) survey (programme 5594), which is led by Guillaume Mahler at University of

Space

I'm calling it – 2026 is going to be the year of the galaxy

We are going to be getting a lot of exciting new information about galaxies in 2026, says Chanda Prescod-Weinstein, who can't wait to see what it can tell us

Comment

Mind

How rethinking your relationship with time could give you more of it

Features

Space

The first commercial space stations will start orbiting Earth in 2026

News

Space

Star that seemed to vanish more than 130 years ago is found again

News

Space

BepiColombo mission will start to unpick Mercury's secrets in 2026

News

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