Tru Physics

Tag: Black Holes

  • Quasar

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    Introduction A quasar, or a quasi-stellar object (QSO), is an extremely luminous active galactic nucleus (AGN). Quasars are among the most distant objects in the universe, and their extreme brightness is generated by supermassive black holes at the center of galaxies. The Power Source of a Quasar The central engine powering quasars is a supermassive…

  • Kerr Black Hole

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    Introduction A Kerr black hole is a type of rotating black hole that is described by the Kerr metric in general relativity. Named after physicist Roy P. Kerr who discovered this solution in 1963, it describes a black hole rotating about an axis of symmetry. Kerr Metric The Kerr metric is given by the line…

  • Hawking Radiation

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    Introduction Hawking Radiation is a theoretical prediction made by physicist Stephen Hawking in 1974. It is a quantum mechanical phenomenon in which black holes emit thermal radiation due to quantum effects near the event horizon. This stands in stark contrast to the classical prediction of general relativity, which asserts that black holes should not emit…

  • General Relativity

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    Introduction General Relativity is a theory of gravitation that was developed by Albert Einstein between 1907 and 1915. Based on his idea of what he called “The Equivalence Principle,” he proposed that gravity is not a force in the traditional sense, but a curvature in spacetime caused by mass and energy. The Field Equations The…

  • Escape Velocity

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    Introduction Escape velocity is the minimum speed an object must have in order to escape the gravitational pull of a planet or other body without further propulsion. Essentially, it is the speed needed to break free from the gravitational field of a massive body. Calculation The escape velocity () from the surface of a spherical…

  • Black Holes

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    Black holes are astronomical objects with an incredibly strong gravitational pull, resulting from a highly compressed mass in a small region of space. They play a significant role in our understanding of the universe, general relativity, and the nature of spacetime. Basic Understanding of Black Holes Black holes form when a massive object, such as…