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Gravitational Theories

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James Clerk Maxwell

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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.

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Isaac Newton

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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.

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Arthur Eddington

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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.

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Albert Einstein

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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.

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Henrietta Swan Leavitt

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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.

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Edwin Hubble

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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.

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Newton's Law of Universal Gravitation

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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.

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Pierre-Simon Laplace

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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.

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Karl Schwarzschild

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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.

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Subrahmanyan Chandrasekhar

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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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