Although the chance of a disaster to planet Earth in a given year may be quite low, it adds up over time, and becomes a near certainty in the next thousand or 10 thousand years.
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"We are very, very small, but we are capable of understanding the universe."
"The universe is a pretty big place. If it's just us, seems like an awful waste of space."
"The world is a dangerous place to live; not because of the people who are evil, but because of the people who don't do anything about it."
"The human race is a single, genetic family. When a child is born, it is born into the human race, not into some particular tribe or nation. The human race is one. And we are all brothers and sisters."
"I am just a child who has never grown up. I still keep asking these 'how' and 'why' questions. Occasionally, I find an answer."
British theoretical physicist whose Hawking radiation work and A Brief History of Time (1988) brought black-hole physics to a mass audience while he lived with ALS for 55 years. Closely associated with Roger Penrose (his collaborator on singularity theorems) and Carl Sagan (fellow popularizer who wrote Brief History's foreword). For an intellectual contrast, see William Lane Craig, American philosopher of religion — Craig's Kalam cosmological argument depends on the Big Bang requiring a divine first cause; Hawking's no-boundary proposal was specifically designed to remove the moment that would require one — the cleanest cosmology-vs-natural-theology contrast in modern thought.
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The probability of a catastrophic event threatening Earth seems small year-to-year, but compound that small risk across millennia and disaster becomes virtually inevitable. This is basic probability math applied to existential risk: even a 0.1% annual chance approaches certainty over thousands of years. Humanity must therefore think beyond individual lifetimes and act on long-horizon threats before they materialize.
Hawking spent his career contemplating the largest scales of time and space — black hole evaporation, the Big Bang, the fate of the universe. His own life, fighting ALS for 55 years against steep odds, gave him an intimate understanding of how probabilities play out over extended time. He repeatedly warned about AI, asteroids, and climate change, urging humanity to become multi-planetary before Earth's luck runs out.
Hawking made this warning during an era of growing awareness of existential risks: climate change entering mainstream science, near-Earth asteroid tracking programs launching, and nuclear arsenals remaining massive post-Cold War. The 1990s-2010s saw the birth of formal existential risk studies at Oxford and Cambridge. Space exploration budgets were shrinking even as scientists identified concrete planetary threats requiring civilization-scale responses.
AI-generated insights based on extensive research and information for context. Factual errors? Email [email protected].
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