Listen to the audiobook version of 'A Brief History of Time'

Despite his disability, Stephen Hawking reshaped our understanding of black holes

His theoretical work—especially on black holes emitting radiation, now known as Hawking radiation—challenged long-held ideas. He also brought complex physics to the public through bestselling books like "A Brief History of Time."

What Stephen Hawking said about time travel

When renowned theoretical physicist Stephen Hawking did not rule out the possibility of time travel in his posthumous book Brief Answers to the Big Questions, many hopefuls got excited. But, unfortunately for them, Hawking believed that yet-to-be discovered laws of physics will prove time travel impossible. This piece outlines some practicalities about the speed of light and wormholes that lend way to Hawking’s prediction.

Stephen Hawking's children's books help make science fun and accessible for kids

Stephen Hawking co-wrote "George’s Secret Key to the Universe" with his daughter, Lucy, to introduce young readers to big questions about the cosmos. In the first book, the protagonist rides a comet and discovers that black holes aren’t black.

Before it was a popular book, 'A Hitchhiker's Guide to the Galaxy' began as a radio series

The science-fiction comedy began as a radio play on BBC Radio 4, broadcast between 1978 and 1980. The first novel appeared in 1979; two years later, it was adapted for television.

Stephen Hawking's condition explained

Diagnosed with ALS at 21 and told he had two years to live, Stephen Hawking went on to change our understanding of black holes and the universe, living 55 more years and defying every expectation.

Stephen Hawking's final message

Famous cosmologist Stephen Hawking—who lived for half a century after being diagnosed with Lou Gehrig's disease—delivered a final speech just before he died in 2018. In the video, Hawking talks about the importance of science and reason in...

With his dry wit, Stephen Hawking warns of AI dangers and explains imaginary time

In this comedic interview with John Oliver, Stephen Hawking discusses his groundbreaking work in theoretical physics, his views on AI, and Oliver's chances of dating Charlize Theron in the multiverse—all with his trademark voice and humorous tone.

Hawking suggested studying black holes could reveal truths about the universe's start

After predicting black holes could evaporate and before undergoing a tracheotomy, Stephen Hawking conducted interviews in his voice, explaining phenomena like black holes and the Big Bang. In this clip, he explains how curiosity drives humans to become “masters of the universe.”

The Big Bang became physically plausible thanks to Stephen Hawking’s thesis

Stephen Hawking's PhD thesis mathematically showed that singularities—points of no volume and infinite density—are an expected feature of nature. It laid the theoretical groundwork for a model of the universe where everything originates from a single point.

Using scientific bets, Hawking challenged and highlighted major physics ideas

Hawking famously placed wagers on high-stakes questions in theoretical physics—such as the Higgs boson—for fun and to draw attention to science. When Hawking lost a bet about Cygnus X-1 being a black hole, he paid up with a magazine subscription.

A blend of brilliance and humor made Stephen Hawking's cameos unforgettable

Throughout his life, he appeared in numerous pop culture moments—from "The Simpsons" to "The Big Bang Theory"—showing his talent for comedy and his love of science outreach. He was the only person to play himself on "Star Trek: The Next Generation," even writing some of his own lines.

'The Theory of Everything' depicts Stephen Hawking through Jane Wilde’s eyes

Stephen Hawking credits Jane Wilde, his first wife, for giving him “something to live for” after his ALS diagnosis. This biographical drama of Hawking’s life, adapted from her memoir, details their relationship and the effects his illness and success in physics had on their marriage.

How Stephen Hawking’s voice became iconic

Stephen Hawking relied on a voice synthesizer after losing the ability to speak due to complications with ALS. Despite technological advances, he refused to change the "Perfect Paul" voice, making it a cornerstone of his public identity.

Stephen Hawking's biggest discovery—Hawking radiation—came from a major mistake

Hawking radiation may not have been discovered without Jacob Bekenstein first convincing Stephen Hawking that black holes follow the laws of thermodynamics. The graduate student showed that black holes could shrink, setting the stage for Hawking's most significant contribution.

Hawking radiation shows black holes slowly evaporate through quantum effects.

Hawking radiation is Stephen Hawking's theoretical prediction that black holes emit radiation and eventually evaporate. Applied to known black holes, their radiation is so weak that it would take vastly longer than the current age of the universe for them to disappear.

Stephen Hawking on the need to explore space

Should we be content with being cosmic couch potatoes? In this interview, the late Professor Stephen Hawking lays out the case for continued and increased human space exploration, despite its cost and challenges.

No one showed up to the party for time travelers organized by Stephen Hawking

In 2009, Hawking hosted a reception but only sent out invitations afterward, hoping that time travelers from the future would attend and prove time travel possible. He later joked it was "experimental evidence" that time travel doesn’t exist.

According to his daughter, Stephen Hawking defied early doubts about his intellect

Lucy Hawking details what it was like to be the daughter of the famed cosmologist and what his life looked like from her eyes. Among the anecdotes was Stephen's enjoyment of being on "The Simpsons" because production gave him a wheelchair with helicopter blades.

Stephen Hawking's early rowing days shaped the bold persona for which he became known

Before gaining fame as a physicist, Hawking was a coxswain at Oxford, where the sport helped him find his social footing and develop leadership skills, even as his motor neuron disease began to emerge.

The interaction of quantum fields with black hole curvatures makes Hawking radiation

The classic explanation of Hawking radiation depicts virtual photons emitted from a black hole's event horizon. A more accurate explanation involves null geodesics, Bogoliubov transformations, and scattered quantum field nodes to explain the emission of thermal radiation.

Read the scathing review of '1984' by science fiction legend Isaac Asimov

Asimov, the author of the "Foundation" series and a major figure in science fiction, tore Orwell's novel apart in a 1980 review, writing, "This is not science fiction, but a distorted nostalgia for a past that never was."

The speech software's origins at MIT led to Hawking's trademark voice being American

Stephen Hawking's trademark voice is called "Perfect Paul," but it mimics Dennis Klatt, an American researcher at MIT who developed the speech synthesis technology. Klatt used his voice during this development, which was immortalized through Hawking.

Quantum physics explained in 22 minutes

Brian Cox, Royal Society Professor for Public Engagement in Science, discusses the fundamental principles of quantum mechanics, emphasizing their importance in understanding the nature of reality and their practical applications in emerging technologies like quantum computers.

From the Big Bang to present—a timeline

A timeline for everything, from the Big Bang to the beginnings of life on Earth. This article lays out, in spans of billions of years, what was happening in the universe as it became the universe. Starting from the Planck era, the earliest known meaningful time, to the probable "Big Crunch" 30 billion years from now, see how the universe has existed and persisted.

Explaining the many-worlds interpretation

A mind-bending, jargon-free account of the popular interpretation of quantum mechanics, helping to explain how something can be in two states at once.

A scientific analysis of famous time travel stories

This 8-minute video explores how time travel influences the narrative arc of several movies, books and video games, from Harry Potter to A Christmas Carol. (Warning: it contains spoilers!) J.K. Rowling and Charles Dickens set myriad parameters as they’re worldbuilding to avoid paradoxes and create quasi-logical timelines. By drawing diagrams as he’s speaking, the video breaks down how time works in some of popular culture’s most beloved fictional universes.

Einstein and the fourth dimension

How Einstein's greatest theoretical achievement contains a simple but mind-bending proposition—the dimension of time is physically connected to the three observable spatial dimensions.

Defying the odds, Stephen Hawking outlived his ALS diagnosis by over 50 years

When diagnosed with ALS, Stephen Hawking was given two years to live. However, he survived with the progressive neurodegenerative disease for over 50 years, highlighting the disease's variability and complexity.

'The Stranger' remains a popular novel for teenagers

Camus' book's themes—alienation, transgression, and existentialism—continue to resonate with adolescent reader. That's also true of other popular teenage touchstones, like Aldous Huxley's "Brave New World," George Orwell's "Nineteen Eighty-Four," and Sylvia Plath's "The Bell Jar," which are still widely read—and assigned by high school teachers. (Some users may experience a paywall.)

Understanding how and when time began requires a theory of quantum gravity

Rewinding the universe to the big bang compresses all matter, energy, space, and time into a single point, necessitating a model that combines general relativity with quantum mechanics. Although physicists understand time to have begun when the universe did, a clear understanding of the mechanisms involved remains unclear.

King has published more than 60 novels

Since 1974, the writer has published a staggering number of books, often releasing a title a year (and sometimes more than that). This comprehensive list from King's official website lists everything the man has ever done, including unpublished stories, long-forgotten television specials, and limited edition novels. It's a fascinating look into the artistic life of one of America's most successful writers.

When the reclusive Thomas Pynchon won the National Book Award, he sent a stand-up comedian to receive the honor

Pynchon's novel "Gravity's Rainbow" won the National Book Award in 1974 (sharing the distinction with Isaac Bashevis Singer's "A Crown of Feathers"), but the writer, who was seldom seen in public, sent the comic "Professor" Irwin Corey in his place. You can read the ridiculously satirical speech, which would be at home in one of Pynchon's novels, in full by clicking through below.

The earliest mention of time travel

Time travel has fascinated humans for centuries. It appears in myths, literature, and science fiction. One of the earliest examples comes from the 400 BCE Hindu epic Mahabharata, describing time dilation long before Einstein’s Theory of Relativity. By the 19th century, stories introduced machines enabling time travel—setting the stage for modern sci-fi.

'Carrie' kick-started a wildly successful career

King has published more than 60 novels—along with dozens of novellas, hundreds of short stories, and several collections of nonfiction—and has sold over 400 million books. This 2024 interview finds him reflecting on his debut novel, and breakthrough hit, "Carrie," and the wild success that followed.

Explore Albert Einstein's Zürich notebook and review his notes on relativity

Within the pages are calculations, sketches and his first attempts at deriving what would be the field equations for gravity. It also documents some dead ends and the difficulties Einstein encountered as he describes part of the mathematics of what would become general relativity, describing it as "too involved."

In 1996, Stephen King dominated the publishing industry, occupying 6 of the 15 spots on the New York Times bestseller list with his 'Green Mile' books.

English cosmologist Stephen Hawking (1942-2018) jokes about alien sightings

"I am discounting the reports of UFOs. Why would they appear to only cranks and weirdos?"

A look at the giants of quantum mechanics

German physicist Max Planck publishes his groundbreaking study of the effect of radiation on a “blackbody” substance, and the quantum theory of modern physics

Early reviews turned ‘Harry Potter’ into an unexpected hit

Though only 500 hardback copies of "The Philosopher’s Stone" were printed in 1997—and mostly sent to libraries, due to doubts it would sell—glowing reviews and word of mouth fueled a surge in demand. Within a year, the book had sold more than 70,000 copies in the UK.

The science behind the movie 'Interstellar'

Christopher Nolan's 2014 sci-fi action film "Interstellar" relies on real science for its wild space-time travel. This infographic dives into the physics basis of the fictionalized Gargantua black hole, the relativity effect, and more.

During the COVID-19 pandemic, readers returned to Camus' 'The Plague'

The 1947 novel, about a city in Algeria that enacts a city-wide quarantine to battle a deadly outbreak, captured readers' attention in the early months of 2020. In the UK, over 2,000 copies of the book were sold in March of that year, over six times what it had sold the month before.

A deep dive into Bob Dylan's 'memoir'

Bob Dylan's "Chronicles: Volume One" is part memoir and part novel, a book that intentionally blurs the line between Dylan's factual biography and the self-mythologizing he's done for over six decades in the public eye. This podcast walks listeners through the book, treating Dylan less like an artist and more like a thought leader.

The US paperbacks of JRR Tolkien's 'Lord of the Rings' series transformed fantasy from a fringe literary genre to a mainstream form.

Time seems to stop for objects at the event horizon of black holes

At that location, the warping of space-time is so severe that the entirety of an object's space-time motion is solely through space, leaving it immobile in the time dimension. Faraway observers looking at the object would see it appear frozen before slowly dimming and reddening.

Because some models of the universe do not incorporate time, it may be an emergent property born from our limited perception of the universe, rather than a fundamental property of reality.

A novelization of 'Star Wars' preceded the movie–and was a massive success

The book "Star Wars: From the Adventures of Luke Skywalker" was released in November 1976, six months before the film it was based on hit theaters. By February, the novel had sold out of its initial print run of 125,000 copies and would quickly sell over 3.5 million copies.

Dystopian satire became more prominent in the 20th century

Although "anti-utopian" stories have always existed, the international conflicts of World War I and World War II inspired some of dystopian literature’s most influential novels, like Yevgeny Zamyatin’s "We," Aldous Huxley’s "Brave New World," and George Orwell’s "1984." In the decades to follow, more writers would follow the example of those early novels, using the dystopian model to critique artificial intelligence, climate change, and more.

Visualizing Einstein's special relativity

Before Einstein developed his theory of general relativity, he worked out what is known as special relativity—or why time is experienced different for different observers. The breakthrough rests on his theory that light travels at a constant...

George Orwell's '1984' is one of the most famous dystopian works

Orwell's life experiences, from living among the poor to witnessing the rise of authoritarian regimes, deeply shaped his worldview. His iconic works, "Animal Farm" and "1984," offered stark warnings about power, control, and propaganda, making him one of the most enduring voices against totalitarianism.

Reader's Digest ranks the 100 best book of all time

Reader's Digest, first published in 1922 and ultimately becoming the most widely read periodical on the planet, created a list of the 100 best books of all time, compiling a list across genre, period, and form. The list includes classics,...