Stephen Hawking: A Journey Through Education, Science, and Time

Stephen Hawking, an English physicist and cosmologist, is considered by many to be one of the greatest minds of the late twentieth and early twenty-first centuries. Born on January 8, 1942, in Oxford, England, and passing away on March 14, 2018, in Cambridge, England, his work combined general relativity and quantum mechanics to explore the universe's origins and structure. His book, A Brief History of Time, published in 1988, became a bestseller, introducing complex cosmological concepts to a broader audience. This article delves into Hawking's educational journey, scientific contributions, and his impact on the world.

Early Life and Education

Stephen Hawking's birth coincided with the three hundredth anniversary of Galileo Galilei's death, a physicist credited with proving that the Earth revolves around the sun. It also came shortly after the three hundredth birthday of Isaac Newton, whose model of the universe remained largely unchallenged for centuries. Both of Hawking’s parents attended Oxford University. His father, Frank, was a physician with aspirations for his son to follow in his footsteps. The family returned to Oxford to escape the potential bombing of London during World War II.

In 1950, the family relocated to St. Albans in Hertfordshire. At age eight, Hawking enrolled in St. Albans School, where he was considered an unexceptional student, although his mathematics teacher inspired him early on. Despite his father's encouragement, Hawking found medicine and biology insufficiently theoretical and chose to major in physics at University College, Oxford. By his own admission, Hawking studied for about an hour a day at Oxford, focusing on theoretical physics to avoid rote memorization.

Higher Education at Oxford and Cambridge

After graduating from Oxford, Hawking wanted to study at Cambridge University with Fred Hoyle, known for his steady-state cosmology, which posits that the universe's structure remains relatively constant over time. However, his acceptance to Cambridge depended on receiving honors from Oxford. Due to his limited studying, his final examination scores were borderline for an honors degree. During an interview, he stated that he would attend Cambridge if awarded honors, otherwise, he would remain at Oxford. He received a first-class honors degree in natural science in 1962.

Upon arriving at Trinity Hall, Cambridge, Hawking learned he would study with Dennis Sciama, another steady-state cosmologist, rather than Hoyle. Sciama proved to be more accessible and open to students developing their own perspectives. However, within months of arriving at Cambridge, Hawking faced a significant health challenge.

The Diagnosis and its Impact

Although he participated in a university crew team as a coxswain, Hawking was never particularly athletic. He began experiencing increasing clumsiness. At his parents' urging, he consulted a doctor and was diagnosed with amyotrophic lateral sclerosis (ALS), also known as Lou Gehrig's disease. This degenerative condition leads to the gradual loss of muscle control, affecting movement, speech, and swallowing. Hawking was initially given only two years to live and entered a period of depression, questioning the point of completing his doctorate. Sciama encouraged him to continue, maintaining high expectations.

Overcoming Adversity

A turning point occurred in 1965 when Hawking married Jane Wilde, a fellow university student. As his condition worsened, he required a cane, then a wheelchair, and eventually an artificial speech synthesizer. Despite the diagnosis, he overcame his depression and continued his work. After completing his doctorate, he became a research fellow at Cambridge.

Through Sciama, Hawking met Roger Penrose, a mathematician who had developed the concept of a "singularity," a point where the laws of mathematics and science break down. Hawking earned his doctorate by suggesting that singularities could be used to understand the universe's structure. He later revised his understanding of singularity, arguing that the laws of physics remain continuous throughout the universe.

Scientific Contributions and Breakthroughs

Hawking's work addressed significant challenges in twentieth-century physics, particularly reconciling relativity, conceived by Albert Einstein, and quantum mechanics. Einstein, despite contributing to quantum mechanics, was uneasy with its uncertainty principle, which suggests that not everything is knowable and measurable. Hawking referred to Einstein's relativity as a "classical theory" because it insisted that everything could ultimately be determined, a view shared with Newtonian mechanics.

One implication of relativity that Einstein avoided was that large stars could collapse into black holes, points with such intense gravitational force that nothing, including light, can escape. Penrose considered black holes to be singularities, unknowable by the laws of physics.

In the 1920s, astronomers began to believe that the universe was expanding. Hoyle’s steady-state cosmology was one model of an expanding universe. However, the big bang theory, which Hoyle dismissed, proposed that the universe began billions of years ago as a compressed point that exploded. This explosion released energy, creating the four forces governing the universe (gravity, electromagnetism, strong nuclear force, and weak nuclear force), as well as elementary particles, atoms, galaxies, stars, and planets. The big bang theory suggests that residual radiation from the explosion pervades the cosmos. Around the time Hawking wrote his doctoral dissertation, this radiation was discovered, leading most physicists to reject Hoyle’s steady-state theory.

In his dissertation, Hawking suggested that the universe was initially a singularity like a black hole and that the big bang could be understood by comparing the universe to a star collapsing into a black hole. Hawking’s analogy reversed the time sequence of a compressing star: the universe explodes from a singularity rather than imploding into one.

Reconciling Relativity and Quantum Mechanics

One of the most significant problems in twentieth-century physics was the incompatibility of relativity and quantum mechanics. Relativity predicted black holes, which should emit no energy. In the 1970s, Hawking applied quantum mechanics to black holes and found that they would emit energy, a phenomenon known as Hawking radiation, and would eventually explode. This meant that the universe before the big bang, analogous to a black hole, would eventually burst like one. Therefore, the big bang could be explained by combining relativity and quantum mechanics, suggesting that neither the primordial universe nor black holes are true singularities.

In a 2005 journal article, Hawking modified his theory of black holes to allow information to be released back into the universe, albeit in a garbled form. In 2014, he called his theory of information being lost in black holes his "biggest blunder."

Hawking believed that the universe was continuous and governed by a single set of laws. This did not imply predictability, as a comprehensive theory of the universe would still include Heisenberg’s uncertainty principle. He cautioned that even with complete knowledge of the laws underlying the universe, accounting for all possible occurrences would require knowing the history of every particle, which is impossible.

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The Grand Unified Theory and the Fate of the Universe

Modern physics recognizes four forces: gravity, electromagnetism, the strong nuclear force, and the weak nuclear force. Einstein sought a "grand unified theory" to account for all four forces but failed, according to Hawking, because he did not incorporate quantum mechanics. Hawking believed the time of the big bang was the key to finding this theory, when the four forces were unified.

The universe took its current shape due to the specific distribution of energy at the time of the big bang. Slight differences could have prevented the formation of galaxies and stars. Hawking proposed that the big bang might have produced regions with different forms of space, matter, and energy, resulting in an infinite number of "baby universes," with the universe humans inhabit being just one possibility.

The ultimate fate of the universe may depend on its matter content. If it contains only visible matter, the universe will expand forever. If there is more matter, it will eventually contract and collapse into a single point. Hawking hypothesized that black holes may have formed from both imploding stars and residues of the big bang. If true, black holes may pervade the universe, and there may be enough invisible matter to reverse its expansion. The universe would then continually explode and expand, making its broad outline predictable. If Hawking is correct, a single set of laws can explain the development of the universe and its contents.

The Higgs Boson and Continued Scientific Inquiry

In 2012, the discovery of the Higgs boson, theorized in 1964 to give elementary particles their mass, disproved another of Hawking's long-held assumptions. Hawking had bet that the Higgs boson would never be found and encouraged the physics community to explore other research areas, such as M theory.

Popularizing Science

Hawking became the Lucasian Professor of Mathematics at Cambridge in 1979, a position once held by Newton, and a fellow of Gonville and Caius College. In 1988, he published A Brief History of Time to inform the public about scientific theory. The book remained a bestseller for 237 weeks and sold over nine million copies. Other popular books followed, including Black Holes and Baby Universes (1993), The Universe in a Nutshell (2001), A Briefer History of Time (2005), God Created Integers: The Mathematical Breakthroughs That Changed History (2005), and The Grand Design (2010). Hawking also co-wrote an illustrated children's book series with his daughter Lucy, including George's Secret Key to the Universe (2009), George's Cosmic Treasure Hunt (2011), and George and the Big Bang (2013), and penned an autobiography, My Brief History (2013).

Later Life and Recognition

In 1985, Hawking underwent an emergency tracheotomy after contracting pneumonia, resulting in the loss of his ability to speak. A computer system was developed to enable him to communicate with an electronic voice, controlled by his little finger, blinking, or cheek movement. He stated that he tried to lead as normal a life as possible and not dwell on his condition.

Hawking received numerous awards and honors for his scientific contributions, including being made a Commander of the Order of the British Empire in 1982 and a Companion of Honour in 1989. He was a member of the Royal Society, an honorary fellow of the Royal Society of Arts, and a member of the National Academy of Sciences in the United States. He received the Eddington Medal (1975), the Hughes (1976) and Copley medals (2006) of the Royal Society, the Albert Einstein Medal (1979), the Wolf Prize in Physics (1988), Prince of Asturias Awards in Concord (1989), the Julius Edgar Lilienfeld Prize of the American Physical Society (1999), the Michelson Morley Award (2003), the Smithson Bicentennial Medal (2005), the Presidential Medal of Freedom (2009), and the Fundamental Physics Prize (2012), as well as a dozen honorary degrees.

Hawking was a popular public speaker, often discussing his concerns about threats to humanity's future from disease, nuclear weapons, and global warming. By 2006, he feared that global warming might be irreversible and that humanity's survival might require colonizing other planets. In 2013, he advocated for further space exploration, believing humanity could not survive another thousand years on Earth.

Hawking considered his work incomplete, acknowledging that science is continually subject to revision. He served as the director of research at Cambridge's Centre for Theoretical Cosmology and as the Sherman Fairchild Distinguished Scholar at the California Institute of Technology (Caltech). He continued to lecture, conduct research, and mentor graduate students throughout his later life.

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