Stephen Hawking's Key Scientific Papers, Explained

Behind the bestselling books lies a body of genuine scientific research that changed physics. This page lists Stephen Hawking's most important papers in plain English: what each one argued, why it mattered, and where it sits in the story of his career. It is not an exhaustive bibliography, but a guide to the work that defined him.

The singularity theorems (1965 to 1970)

"The Singularities of Gravitational Collapse and Cosmology" (1970), with Roger Penrose, published in the Proceedings of the Royal Society. This is the landmark paper. Building on the methods Roger Penrose had developed for collapsing stars, Hawking and Penrose proved that, under general relativity, the universe must have begun from a singularity: a point of infinite density. It established that the Big Bang was not an optional feature of one model but an unavoidable consequence of the theory. The roots of this work lie in Hawking's PhD thesis. See the full explainer on the singularity theorems.

The four laws of black hole mechanics (1973)

"The Four Laws of Black Hole Mechanics" (1973), with James Bardeen and Brandon Carter. This paper laid out a set of laws governing black holes that looked uncannily like the laws of thermodynamics. At the time Hawking regarded the resemblance as only an analogy. Within a year, his own work would reveal it was something far deeper. The story is told under black hole thermodynamics.

Hawking radiation (1974 to 1975)

"Black hole explosions?" (1974), published in Nature, and "Particle Creation by Black Holes" (1975), in Communications in Mathematical Physics. These are his most famous and most important papers. By applying quantum mechanics to the space around a black hole, Hawking showed that black holes are not completely black: they emit radiation, slowly lose mass, and can eventually evaporate. This united gravity, quantum theory and thermodynamics in a single startling result. It is the discovery carved on his memorial stone, and the reason he is considered one of the great physicists of the century. Read the full explainer on Hawking radiation.

The no-boundary proposal (1983)

"Wave Function of the Universe" (1983), with James Hartle, published in Physical Review D. Often called the Hartle-Hawking state, this paper proposed a way to describe the universe with no initial boundary in time, using the idea of imaginary time. It was an attempt to explain the very origin of the cosmos in quantum terms, removing the need for a beginning at which the laws of physics break down. Hawking considered it among his most important contributions, and its work with James Hartle occupied him for years.

The information paradox papers (1976 onward)

"Breakdown of Predictability in Gravitational Collapse" (1976), in Physical Review D. Here Hawking argued that information falling into a black hole is truly destroyed, appearing to violate a core rule of quantum mechanics. This launched the decades-long black hole information paradox, one of the deepest unresolved puzzles in physics, and one Hawking returned to repeatedly, including a famous public change of mind in 2004.

Later work

Hawking continued publishing into his final years, including work on the information paradox with Malcolm Perry and Andrew Strominger, such as "Soft Hair on Black Holes" (2016), which explored a possible mechanism for preserving information. His scientific output spanned more than five decades.

How to read the originals

Many of these papers are technical and aimed at physicists. Hawking's own popular books translate the ideas for general readers, and the science section of this site explains each major result in plain English. For how these papers fit into his life, see the timeline; for the academic community around them, see his students and academic lineage.