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Gravitational Theories
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James Clerk Maxwell
Developed Maxwell's equations, which describe the behavior of electric and magnetic fields. Significance: Though not directly about gravity, his work unified magnetism, electricity, and light, and laid the groundwork for modern theories of physics, including effects on spacetime and gravity.
Isaac Newton
Proposed the Universal Law of Gravitation and the three laws of motion, laying the groundwork for classical mechanics. Significance: His formulation of the laws of motion underpins much of classical physics and engineering and remained unchallenged until the emergence of theories of relativity and quantum mechanics.
Arthur Eddington
Played an important role in validating General Relativity through the 1919 solar eclipse expedition, which confirmed the bending of starlight near the Sun. Significance: His observations provided one of the earliest empirical validations of General Relativity, cementing its acceptance.
Albert Einstein
Developed the theory of General Relativity, which describes gravity not as a force but as the curvature of spacetime caused by the presence of mass and energy. Significance: Transformed our understanding of gravity and predicted phenomena like the bending of light around massive objects, the expansion of the Universe, and the existence of black holes and gravitational waves.
Henrietta Swan Leavitt
Discovered the period-luminosity relationship for Cepheid variable stars. Significance: Her work on Cepheids as 'standard candles' provided a method for measuring astronomical distances, which is essential for studying the scale of the universe and its expansion.
Edwin Hubble
Established Hubble's Law, the observation that galaxies are moving away from us at speeds proportional to their distance. Significance: Provided the observational foundation for the expanding universe and consequently for Big Bang cosmology.
Newton's Law of Universal Gravitation
Every mass attracts every other mass with a force proportional to the product of their masses and inversely proportional to the square of the distance between their centers. Significance: Provided the first comprehensive and predictive theory for understanding the gravitational forces in the solar system.
Pierre-Simon Laplace
His work on celestial mechanics, specifically on stability of the solar system and the mechanics of planetary orbits, improved upon Newton's theories. Significance: Renowned for proposing the Laplacian determinism and the nebulosity hypothesis regarding the formation of the solar system.
Karl Schwarzschild
Found the first exact solution to Einstein's field equations of General Relativity, known as the Schwarzschild solution. Significance: His solution describes the gravitational field outside a spherical non-rotating mass such as a non-rotating black hole, leading to the concept of the Schwarzschild radius.
Subrahmanyan Chandrasekhar
Formulated the Chandrasekhar limit, the maximum mass (approximately 1.4 solar masses) that a stable white dwarf star can have before collapsing to form a neutron star or black hole. Significance: Provided understanding of the end stages of stellar evolution and the formation of compact objects.
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