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Subrahmanyan Chandrasekhar
1910–1995 · Astrophysicist
A Nobel Prize-winning astrophysicist who established an upper mass limit for white dwarf stars and made wide-ranging contributions to theoretical astrophysics.
“The black holes of nature are the most perfect macroscopic objects there are in the universe: the only elements in their construction are our concepts of space and time.”
Why is this scientist famous?
Discovering the Chandrasekhar limit, the maximum mass of a white dwarf star, and making fundamental contributions to our understanding of stellar evolution.
Subrahmanyan's story
A Prodigy from Lahore
Subrahmanyan Chandrasekhar was born on October 19, 1910, in Lahore, then part of British India and now in Pakistan. His father was a civil servant with a strong interest in music, his mother encouraged his education, and his uncle was the Nobel Prize-winning physicist C. V. Raman. Known to his family as 'Chandra,' he studied physics at Presidency College in Madras, now Chennai. In 1930, at age 19, he received a Government of India scholarship to pursue graduate study at Cambridge University.
The Voyage That Changed Astronomy
During the 1930 sea voyage from India to England, Chandrasekhar began applying special relativity and quantum statistics to the structure of white dwarf stars. Continuing this work at Cambridge, he showed that a white dwarf has an upper mass limit of about 1.4 times the mass of the Sun. Above this limit, it cannot remain stable as a white dwarf; later stellar evolution may produce a neutron star or black hole, depending on the star's mass and other conditions.
The Battle with Eddington
In January 1935, Chandrasekhar presented his conclusions about white dwarfs to the Royal Astronomical Society. Sir Arthur Eddington publicly criticised the work, challenging the physical implications of Chandrasekhar's calculations. In a later lecture at Harvard in 1936, Eddington dismissed the theory as 'stellar buffoonery'. The disagreement affected the early reception of Chandrasekhar's work, but he continued developing it and published An Introduction to the Study of Stellar Structure in 1939.
A Life in America
Chandrasekhar accepted an appointment at the University of Chicago's Yerkes Observatory in 1937 and remained at the university for the rest of his career. His research and books covered stellar structure, stellar dynamics, radiative transfer, hydrodynamic stability, black holes, and other areas of mathematical physics. He also served as managing editor of The Astrophysical Journal from 1952 to 1971.
Vindication
The Chandrasekhar limit became established as a fundamental result in astrophysics, while later discoveries of compact stars and developments in relativistic astrophysics clarified the possible outcomes of stellar collapse. In 1983, Chandrasekhar shared the Nobel Prize in Physics with William Fowler for theoretical studies of the physical processes important to the structure and evolution of stars. The National Aeronautics and Space Administration (NASA) launched the Chandra X-ray Observatory, named in his honour, in 1999.
Legacy
Chandrasekhar died in Chicago on August 21, 1995, at the age of 84. His work helped establish the theoretical foundations for understanding white dwarfs and made important contributions across stellar dynamics, radiative transfer, hydrodynamic stability and black-hole theory. The Chandra X-ray Observatory continues to commemorate his contributions to astrophysics.
What did they discover?
The Chandrasekhar Limit
He showed that a white dwarf supported by electron degeneracy pressure has an upper mass limit of about 1.4 times the mass of the Sun. Above this limit, a star cannot remain supported as a white dwarf and must undergo further evolution or collapse.
Stellar Dynamics
His work on the dynamics of star clusters — how stars move and interact under gravity within galaxies — became the standard reference in the field and is still used by astronomers today.
The Mathematical Theory of Black Holes
His 1983 book The Mathematical Theory of Black Holes presented a detailed mathematical treatment of black-hole solutions in general relativity.
Radiative Transfer in Stars
He made fundamental contributions to understanding how radiation travels through the atmosphere of stars, solving complex mathematical equations that describe how light moves through hot, glowing gas.
Gravitational Waves
Late in life, he worked on the mathematical theory of gravitational waves, ripples in spacetime predicted by Einstein, decades before they were directly detected in 2015.
Amazing facts
During his 1930 voyage from India to England, at age 19, he began calculations that contributed to his later formulation of the white-dwarf mass limit.
He was the nephew of C. V. Raman, who won the Nobel Prize in Physics in 1930, making them one of the few Nobel-winning uncle-nephew pairs.
Sir Arthur Eddington criticised Chandrasekhar's white-dwarf calculations at a Royal Astronomical Society meeting in 1935 and used the phrase ‘stellar buffoonery’ about them in a separate lecture at Harvard in 1936.
His theoretical studies of the physical processes important to stellar structure and evolution were recognised with the 1983 Nobel Prize in Physics.
He spent 58 years at the University of Chicago, one of the longest academic careers in physics.
He served as managing editor of The Astrophysical Journal from 1952 to 1971.
NASA named the Chandra X-ray Observatory after him, one of its four Great Observatories alongside Hubble.
He was known for his extraordinary mathematical precision and his belief that physics should be beautiful as well as correct.
He mentored dozens of young astrophysicists who went on to make major discoveries of their own.
His collected research papers fill several library shelves, covering almost every area of theoretical astrophysics.
Timeline
Born in Lahore, British India (now Pakistan)
Graduated from Presidency College in Madras and won a scholarship to Cambridge University
Began calculations on relativistic white-dwarf structure during the sea voyage to England
Completed his PhD at Cambridge University
Eddington publicly criticised Chandrasekhar's white-dwarf work at a Royal Astronomical Society meeting.
Joined the University of Chicago, where he would spend 58 years
Published his landmark book on stellar structure
Awarded the Nobel Prize in Physics for his work on stellar structure and evolution
Died in Chicago on August 21, age 84
NASA launched the Chandra X-ray Observatory, named in his honour
Awards & honours
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