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A white hole is a theoretical solution to Einstein's field equations - a region which cannot be entered at all from the outside. In a sense, therefore, they are the time-reversed opposites of black holes. The theory suggests that a black hole is connected to a white hole via a tunnel called an Einstein-Rosen bridge (wormhole). Matter falls into the black hole and is expelled via the white one. Some theorists even argue that the Big Bang itself is a white hole, gushing out matter and creating a new universe while, on the other end, invisible and unreachable, is a black hole in a totally different universe.

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White Holes review: Extreme physics from Carlo Rovelli

We all know about black holes – we've even seen a picture of one. But white holes? In his latest book, theoretical physicist Carlo Rovelli weaves a poetic spell to persuade us that these mysterious entities are real

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FRANCE - CIRCA 2002: Eve, 1896, by Lucien Levy-Dhurmer (1865-1896), pastel and gouache, 49x46 cm. (Photo by DeAgostini/Getty Images); . (Photo by DeAgostini/Getty Images)

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Eve review: Why women's bodies belong at the heart of human evolution

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Two beguiling books show how mathematics is revolutionising our lives

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Two beguiling books show how mathematics is revolutionising our lives

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Seventh Son author Sebastian Faulks: 'I'm 3.7 per cent Neanderthal'

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Seventh Son author Sebastian Faulks: 'I'm 3.7 per cent Neanderthal'

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2G6HE5R ANNIE JUMP CANNON (1863-1941) American astronomer and suffragist. about 1920

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Her Space, Her Time review: Trailblazing women astronomers

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2KJXNKB Leipzig, Germany. 25th Nov, 2022. Participants of a demonstration of the trade union Verdi walk with flags and carry a banner with the inscription

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Blood in the Machine review: Going back to the Luddites

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Screengrab from the video game Cocoon. From Jeppe Carlsen, the lead gameplay designer of LIMBO and INSIDE ? COCOON takes you on an adventure across worlds within worlds. Master world-leaping mechanics and solve intricate puzzles to unravel a cosmic mystery. BEST AVAILABLE QUALITY

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Cocoon review: One of the biggest gaming treats of the year

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1st Place Hassanain Qambari & Jayden Dickson The Lions Eye Institute Department of Physiology & Pharmacology Perth, Western Australia, Australia Rodent optic nerve head showing astrocytes (yellow), contractile proteins (red) and retinal vasculature (green) Confocal, Fluorescence, Image Stacking 20X (Objective Lens Magnification)

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Intricate photo of rat's retina wins Nikon Small World competition

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Netflix handout still: Chimp Empire. Chimp Empire. Damien in Chimp Empire. Cr. Netflix ?? 2023

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91av recommends: Spies, Lies and Deception and Chimp Empire

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Lessons in Chemistry review: TV show delivers – just stay with it

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Lessons in Chemistry review: TV show delivers – just stay with it

When Lessons in Chemistry, the story of a woman scientist frustrated by the times she lives in, finally finds its stride, it is a reminder that things can come together with patience

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Extremely Online review: A vital look at the creator economy

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Julia review: A brilliant, devastating sequel to Nineteen Eighty-Four

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91av recommends: Children of Memory and They Cloned Tyrone

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Of Time and Turtles review: What can we learn from turtles?

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