The 19-Year-Old Who Solved a Star's Fate at Sea and Waited 53 Years for the Nobel Prize

In late July 1930, a young man boarded a ship leaving India for Cambridge. Subrahmanyan Chandrasekhar, known to everyone as Chandra, was 19. He carried a three-year scholarship from the Indian government and was headed to Trinity College, where Ralph Fowler would supervise his work. During the voyage he kept reading scientific papers and kept returning to one problem: white dwarfs, the dense remnants of stars that have used up their nuclear fuel.

He came from Lahore, then part of British India and now in Pakistan, where he was born in 1910, the first son and third child in a family of four sons and six daughters. His father worked in the government's audits and accounts service and wanted him in the civil service. His mother, Sita, was highly educated, had translated Ibsen's A Doll's House into Tamil, and encouraged him toward research. The family moved to Madras in 1918. Chandra studied at home with tutors until he was about 11 or 12, then went straight into the third form of high school, and entered Presidency College at 15. His uncle, C. V. Raman, had left a senior government post for science and won the Nobel Prize in Physics in 1930.

A summer in Raman's Calcutta laboratory in 1928 went badly; Chandra broke a crucial piece of equipment early on, and it suggested to him that his strengths lay in theory. That same year the German physicist Arnold Sommerfeld visited Presidency College on a lecture tour. Chandra met him, and Sommerfeld told him the quantum theory in his famous book was already out of date, overtaken by Schrödinger, Heisenberg, Dirac and Pauli. He handed Chandra the proofs of an unpublished paper applying new statistics to electrons in metals. The same approach had helped Fowler explain white dwarfs, which are roughly planet-sized but can hold as much mass as the Sun. At 18, still an undergraduate, Chandra wrote his first paper on the subject, and Fowler helped place it in the Proceedings of the Royal Society. He would go on to write around 400 papers.

At sea, he asked whether there was an upper limit to how massive a white dwarf could be. Fowler had shown that tightly packed electrons produce pressure that holds such a star against gravity. Chandra repeated the calculation but added Einstein's special relativity, since the electrons move at speeds near that of light. The result changed: past a certain mass, the star could not stay stable, its density would keep rising, and it would collapse further. The figure is about 1.4 solar masses, commonly given as 1.44. In his paper he wrote that the life history of a small star must be essentially different from that of a large one, and that for massive stars one is left speculating on other possibilities. Those possibilities later became central to the study of neutron stars and black holes.

Getting the answer was easier than getting it accepted. Fowler was puzzled by Chandra's second paper and sent it to Edward Arthur Milne; months passed without a reply, and in November 1930 Chandra submitted it directly to the Astrophysical Journal. He spent his third graduate year at Niels Bohr's institute in Copenhagen on Paul Dirac's advice, finished his PhD in 1933, and that October won a prize fellowship at Trinity, an honor that, according to biographer Luisa Bonolis, only Ramanujan had previously held among Indians.

By the end of 1934 he had two papers ready for the Royal Astronomical Society and was invited to present them in January 1935. Sir Arthur Eddington, the leading astronomer of the day, believed stars ended as white dwarfs. He had followed Chandra's work for years, visited to discuss it, and even arranged double the usual speaking time. Then he scheduled his own talk right after Chandra's and attacked the conclusions before the audience. Bonolis reports he called the theory "a stellar buffoonery" and said there was "no such thing as relativistic degeneracy." Some scientists privately told Chandra he was right, but none defended him at the meeting.

The damage was real. Eugene Parker, a University of Chicago colleague, later said the episode closed the doors in England. Chandra's father suggested he return to India, but Chandra felt academic politics there would not suit him, and he began looking toward the United States. Looking back, he said that if Eddington had praised the work, his reputation could have made Chandra famous at once, and that you then lose your motivation to continue doing science. The Nobel Prize, which came 53 years after the calculation, was still decades away, and the limit itself remains a pillar of how astronomers understand the deaths of massive stars.