Edwin Hubble is credited for the discovery of the expanding universe. In 1929, he published a paper that showed that the light from distant galaxies was shifted to longer wavelengths, a phenomenon known as redshift. This redshift is caused by the expansion of space, and it provided the first direct evidence that the universe is expanding.
Niels Bohr was a Danish physicist who made significant contributions to the development of quantum mechanics. He is best known for his work on the Bohr model of the atom, which was the first successful model to explain the stability of atoms.
S Chandra Shekhar was an Indian astrophysicist who made significant contributions to the study of stellar evolution. He is best known for his work on the Chandrasekhar limit, which is the maximum mass that a stable white dwarf star can have.
C.V. Raman was an Indian physicist who made significant contributions to the study of light scattering. He is best known for his discovery of the Raman effect, which is the scattering of light by matter that results in a change in the wavelength of the light.
While all of these scientists made significant contributions to their respective fields, only Edwin Hubble is credited for the discovery of the expanding universe.