Astrophysicist, cosmologist, lecturer, media star, author, parent, grandparent -- Stephen Hawking wore many hats in life. But there's even more to one of the world's most famous cheerleaders of science.
Maybe you've heard of his theories on black hole radiation and the origins of the universe, or perhaps you're a fan of his dry sense of humor or speculation about the existence of aliens and God. With his 1988 book "A Brief History of Time" selling more than 10 million copies worldwide, you may think Hawking's ability to become a household name stemmed from his talent for piquing the imaginations of the masses. Either way, Hawking brought us along for the ride in his intellectual explorations to the edge of the universe and beyond.
Hawking's attitude and value for life gave his work a philosophical feel. After surpassing doctors' expectations of living a couple of years, he thrived for nearly five decades with amyotrophic lateral sclerosis (ALS), a motor neuron disease that eventually restricted him to a wheelchair and limited his ability to speak without the aid of technology. He died peacefully at his home on March 14, 2018.
When asked about the meaning of life in a 2011 interview with The Guardian newspaper, Hawking replied, "We should seek the greatest value of our action." Despite physical limitations, he said his mind was freer than ever -- a duality some say propelled him to function at the level of genius.
In this article, we'll look at what made Hawking tick, as well as where his work fit in the larger realm of science. On top of it all, we'll explore his appearance as a larger-than-life scientist in light of his challenges managing an increasing physical disability.
Before we delve into the mechanics of black holes and Hawking's views of the universe, let's visit where his life started: amid World War II in Oxford, England.
Stephen Hawking was born in Oxford, England, on Jan. 8, 1942, on the 300-year anniversary of the death of Galileo. The family moved from Oxford to St. Albans, a town north of London, when Hawking was 8 years old. His father's routine research trips to Africa and his mother's left-leaning thinking made for a rather interesting upbringing. The fact that Hawking's parents used a former London taxi as the family car certainly drew attention, too.
Although Hawking's interest in math became apparent to him by his 14th birthday, it wasn't until college that he would delve into physics [source: White & Gribbin]. Hawking famously admitted that he was a less-than-stellar student during his early years. His father, who excelled in medicine, wanted him to follow in his footsteps while Hawking attended University College, Oxford. But Hawking's interests would lead him elsewhere -- to the edge of the universe, you could say.
While studying physics at University College, he lived the life of most students, partaking in the university's rowing team and parties. Friends and colleagues recall his outgoing sense of humor and popularity during his youth [source: Ferguson].
But things would soon change after receiving his first degree and venturing to Cambridge for his doctorate.
First, Hawking's crossed paths with Jane Wilde at a campus party in 1963, where the couple hit it off. They married in 1965. Second, the then 21-year-old was diagnosed with amyotrophic lateral sclerosis (ALS), the condition also known as Lou Gehrig's disease that damages nerve cells and negatively affects a person's ability to move. Even more shocking was Hawking's prognosis: At the time, his doctors told him he had roughly two years to live.
Suddenly, Hawking had a new outlook on life. He found a burst of vigor in pursuing his doctorate in cosmology at Cambridge University. This is where his contributions to physics really took root. With time, his work earned him 12 honorary degrees and the Lucasian professorship at Cambridge -- an honor once held by the likes of Isaac Newton and Charles Babbage.
Friend and biographer Kitty Ferguson said Hawking carefully guarded his personal life. Because he needed a voice synthesizer to communicate, Hawking was selective about what he said on certain topics.
The stress of caring for a husband with ALS, as well as their three children, put a lot o strain on that first marriage. (Jane also wrote that he had a "massive and fractious ego.") She came to lean on Jonathan Hellyer Jones, who would later become her second husband. Concerning his first wife's decision to become romantically involved with another person, Hawking said, "It was fine, as long as she went on loving him" [source: Ferguson]. Hawking himself became involved with one of his caregivers, Elaine Mason, which led to Jane and Stephen divorcing in 1991.
Hawking and Mason married in 1995 but divorced in 2006, with lingering allegations of Mason abusing Hawking -- a situation he denied and refused to talk about to police [sources: Ferguson; The New York Times].
To begin to understand Hawking's contributions, we must look at the tiny, subatomic particles that comprise everything in our universe. For instance, particle pairs are constantly appearing and disappearing together. In every pair, there's a particle and an antiparticle with the opposite properties, like a proton and its corresponding antiparticle, the antiproton. Without being interrupted, these particles simultaneously appear, cancel each other out and disappear as fast as they arrived.
But Hawking wondered what would happen to these particles if they were face-to-face with a black hole. In the 1970s, Hawking put forth the idea that a black hole likely sucks in one particle -- usually the antiparticle -- while allowing the other particle to escape. According to Hawking's theory, it's this leftover particle at the entrance of a black hole that ends up being emitted as a type of radiation called Hawking radiation.
He hypothesized that since the other particle falls into the black hole, it helps reduce the mass of the black hole by that incremental amount. Over time, black holes decrease in mass and collapse, resulting in a huge explosion that spits out matter throughout space. In a sense, Hawking's work suggests there's a lot more going on in black holes and the areas around them.
Since researchers have to measure the presence of black holes indirectly, it's been difficult to confirm or counter Hawking's theory. One group created a miniature black hole of sorts in a lab and observed that Hawking radiation could be real [source: Shiga]. Still, others think the theory can only be confirmed by evidence from a real black hole.
Then followed the information paradox -- the debate surrounding what happened to qualities of matter once inside a black hole.
Hawking wasn't afraid to be bold in drawing conclusions. In 1997, he made a bet with colleague John Preskill, arguing that information is permanently lost once it falls into a black hole [source: Hogan]. But in 2004, Hawking admitted that information isn't lost or channeled into another universe, but rather it seeps back into the existing universe in distorted form.
Hawking publicly admission of defeat confirmed his attitude toward science as a field that's constantly adding to and correcting itself. His work on black holes might not seem particularly groundbreaking at first glance, but it spurred conversation that might not have taken place otherwise
What did Hawking think about the origins of the universe? Find out on the next page.
Stephen Hawking's ideas also took him to the edge of the universe and back to where it all started. Along with scientist James Hartle, Hawking put forth an idea of what happened before the Big Bang.
Because the universe is constantly expanding, scientists have suggested that the origins of the universe can be traced by thinking about the process in reverse. While backtracking, Hawking and Hartle realized the universe becomes smaller until you reach the extremely dense and high-energy ball necessary for the Big Bang to violently set the beginnings of the universe in place. Yet as you get smaller and smaller, you start seeing the origins of the universe at the subatomic level.
Here's where things get a bit complicated. The duo theorized that once you get to such a tiny, detailed level -- where particles spontaneously pop up and disappear, space becomes separated from time. In essence, time loses the meaning we traditionally assign to it. As a result, it's impossible to measure events before the Big Bang because time -- as we know it -- doesn't exist.
Hawking and Hartle said the universe doesn't have a boundary, much like Earth's rounded surface lacks an edge. Hawking likened his no-boundary proposal (aka Stephen-hawking-Hartle state) for the universe to traveling southward until you reach the South Pole. When you reach the South Pole, the term "south" loses its meaning. The same idea is applied to time before the Big Bang -- once you trace back the universe to its beginning, the concept of time (as we define it, at least) becomes obsolete.
Biographer and science writer Kitty Ferguson said the no-boundary proposal is less accepted than Hawking radiation. "To this day there are many people in physics who don't accept it as something in physics that can be used as part of other theories -- you can't use it as a starting off point to go somewhere else," Ferguson said.
In later years, Hawking doubted the possibility of a "theory of everything" existing, an all-encompassing theory of theoretical physics that would explain pretty much everything [source: Sample]. He was also a skeptic on finding the Higgs boson, an elusive particle thought to give subatomic particles mass, and lost a bet in 2012 when it was discovered.
Read on to learn about Hawking's more speculative theories.
"I regard the brain as a computer which will stop working when its components fail. There is no heaven or afterlife for broken down computers; that is a fairy story for people afraid of the dark," Hawking famously said in a 2011 interview with The Guardian.
At the root of the physicist's beliefs lay the idea that the universe did not need a creator to begin. This is because he thought the conditions in which the universe began could have spontaneously happened elsewhere. Some labeled his thoughts as atheistic, but those close to Hawking say he never used that term to describe himself [source: Ferguson].
Instead, Hawking viewed God as the embodiment of the laws of physics.
"It's not a personal God in which you have a personal relationship with, or a God that interferes in life -- in our lives or in the universe in general," said Kitty Ferguson, Hawking's friend and biographer in a 2012 interview with HowStuffWorks. "He does think his no-boundary proposal wipes out the need for God as a creator."
Hawking's comments about God were usually communicated directly through media outlets, leading some people to wonder whether there were simply made to get more publicity [source: Fahy].
The well-known scientist also became more speculative about the existence of aliens in the universe, too. He thought it's probable that other life forms exist and compared a possible alien visit to Earth to Columbus' trip to the Americas. Extraterrestrials likely have more advanced technology and the potential need to conquer the planet for power or resources, which would lead humans to potentially be wiped out from war or disease [source: Huessner]. Therefore we should not try to communicate with aliens.
Lastly, we'll examine how Hawking adapted to some of the challenges of ALS.
After Hawking was diagnosed with amyotrophic lateral sclerosis (ALS) at 21 years of age, he was forced to balance the stresses of academic life with physical illness. The disease negatively affects brain and spinal neurons, making patients lose control of voluntary motor function and movement.
During the first few years, his condition worsened rapidly. Soon he relied on a wheelchair. By 1974, Hawking was unable to feed himself. Fortunately, the progression of the disease slowed a bit, eventually becoming more gradual over the years. With time, however, he still began losing the use of his voluntary muscles, hands and certain facial expressions.
Hawking previously used his finger to control a computer and voice synthesizer. But once he lost use of his hands, he started depending on twitching a cheek muscle to communicate. Most computers designed for him relied on running lists of words. Whenever the cursor reached a word or phrase he wished to use, Hawking twitched his cheek muscle to select it. Then he'd go on to the next word until he created a sentence. In the 1990s, by selecting words with his finger, he could pick 10 to 15 words per minute. But with the difficulty of twitching a cheek muscle, he could select just about one word per minute [source: Ferguson]. Because of this, most of Stephen Hawking's speeches and interviews were done in advance to save time.
Hawking died at age 76 at his home in Cambridge, leaving behind three children and three grandchildren. "He once said, 'It would not be much of a universe if it wasn't home to the people you love.' We will miss him forever," said his children in a joint statement released after his death in 2018. A 2014 movie about his life, "The Theory of Everything" won an Oscar for Eddie Redmayne who portrayed him.
For more information about Stephen Hawking and his work, check out the next page.
Originally Published: Jan 30, 2012
More Great Links
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