Biographical sketch of the English astrophysicist who performed the first observational test of the gravitational bending of light near the Sun; from the MacTutor History of Mathematics Archive (University of St. Andrews).

Wikipedia article about the American physicist who was involved in a number of observational tests of general relativity and who developed a generalization of Einstein's theory (Jordan-Brans-Dicke theory).

Brief biography of the Dutch astronomer who was one of the first to think about the theory's cosmological applications (de Sitter space); from the MacTutor History of Mathematics Archive (University of St. Andrews).

Biographical sketch of the Indian astrophysicist who was the first to model stellar stability using both relativity and quantum theory; from the MacTutor History of Mathematics Archive (University of St. Andrews).

Wikipedia article about the Australian physicist, one of the pioneers of black hole mechanics.

Biography of the Austrian-born, British cosmologist whose name is associated with steady-state cosmology, Tolman-Bondi solutions, accretion onto black hole, and the k-calculus; from the MacTutor History of Mathematics Archive (University of St. Andrews).