Stephen Hawking — "Cosmology is the study of the large scale structure of the universe, and how it …"
Cosmology is the study of the large scale structure of the universe, and how it has evolved over time.
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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
Cosmology examines the universe as a complete system — its overall architecture, its contents at the grandest scales, and how everything from galaxies to dark matter has changed across billions of years. It asks the most fundamental questions humans can pose: where did everything come from, what is it made of, and where is it headed. It is science operating at its absolute limits of scale and time.
Relevance to Stephen Hawking
Hawking spent his entire career at the frontier of cosmology, producing landmark work on the Big Bang, black hole thermodynamics, and Hawking radiation. His PhD thesis tackled the large-scale structure of spacetime itself. His bestselling book 'A Brief History of Time' was essentially an attempt to bring cosmological thinking to everyone, reflecting his belief that these grand questions belong to all humanity, not just specialists.
The era
Hawking's active decades — 1960s through 2010s — saw cosmology transform from a largely theoretical backwater into an empirically rich field. The discovery of the cosmic microwave background (1965), inflation theory, dark matter confirmation, and finally dark energy (1998) all landed during his career. He worked during the era when humanity first genuinely began answering how the universe evolved, making his definition not merely academic but historically charged.
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