Stephen Hawking — "I believe that we are alone in the universe, but I hope we are not."
I believe that we are alone in the universe, but I hope we are not.
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More from Stephen Hawking
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About Stephen Hawking (1942-2018)
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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Understanding this quote
What it means
Science demands evidence before declaring anything true — and we have none that other intelligent life exists. Yet the rational mind and the lonely human heart don't always align. This quote holds both: an honest scientific conclusion drawn from silence in the cosmos, and a private wish that the universe harbors other minds. It captures the difference between what evidence forces us to believe and what we genuinely hope is true.
Relevance to Stephen Hawking
Hawking devoted his career to understanding the universe's deepest structures — black holes, the Big Bang, time itself. Diagnosed with ALS at 21, he spent decades communicating through a single cheek muscle, physically isolated yet cosmically connected. He publicly warned in 2010 that alien contact could be catastrophic for humanity, comparing it to Europeans arriving in the Americas. That tension underscores the quote: his longing was real, but never naive.
The era
During Hawking's lifetime, humanity's search for extraterrestrial life transformed from fringe speculation into serious science. SETI launched in 1960; NASA's Kepler telescope confirmed thousands of exoplanets after 2009; extremophile discoveries expanded notions of where life could survive. Yet the Fermi Paradox — if the universe is vast and old, where is everyone? — grew louder with each failed signal search, making the cosmic silence Hawking referenced feel increasingly profound.
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