The Brahmanas, part of the Vedas, contain references to a region called 'Krishna-loka' or 'black world', which is believed to be a black hole.

Ancient Indian texts describe the final stage of a massive star's life as a 'black hole', where it collapses under its own gravity.

Subrahmanyan Chandrasekhar, an Indian-American astrophysicist, proposed the existence of neutron stars in his 1931 paper, 'The Maximum Mass of Ideal White Dwarfs'.

Neutron stars typically have masses between 1.4 and 3 solar masses, which is known as the Chandrasekhar limit.

C. V. Vishveshwara, an Indian physicist and cosmologist, proposed the concept of a 'black hole singularity' in his 1958 paper, 'The Kerr Solution'.

The event horizon is the boundary in spacetime beyond which nothing, not even light, can escape the gravitational pull of a black hole.

J. B. Joshi, an Indian astrophysicist, proposed the idea of 'gravitational collapse' in his 1966 paper, 'Gravitational Collapse and the Formation of Black Holes'.

Neutron stars have extremely high densities, typically ranging from 10^15 to 10^17 grams per cubic centimeter.

T. Padmanabhan, an Indian physicist and cosmologist, proposed the idea of 'black hole thermodynamics' in his 1973 paper, 'Thermodynamical Aspects of Gravity: New Insights'.

Gravitational lensing is the bending of light around massive objects, such as black holes, due to their strong gravitational fields.

R. K. Pathria, an Indian physicist and cosmologist, proposed the idea of 'naked singularities' in his 1983 paper, 'Naked Singularities: A Critical Review'.

Neutron stars have very small radii, typically ranging from 10 to 100 kilometers.

T. Padmanabhan, an Indian physicist and cosmologist, proposed the idea of 'quantum gravity' in his 1996 book, 'Gravitation: Foundation and Frontiers'.

Accretion is the process by which matter from the surrounding environment falls onto a compact object, such as a black hole or neutron star.

T. Padmanabhan, an Indian physicist and cosmologist, proposed the idea of 'black hole entropy' in his 2005 paper, 'Thermodynamical Aspects of Gravity: New Developments'.