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单词 Schwarzschild radius
释义
Schwarzschild radius

Physics
  • A critical radius of a body of given mass that must be exceeded if light is to escape from that body. It is equal to 2GM/c2, where G is the gravitational constant, c is the speed of light, and M is the mass of the body. If the body collapses to such an extent that its radius is less than the Schwarzschild radius, the escape velocity becomes equal to the speed of light and the object becomes a black hole. The Schwarzschild radius is then the radius of the hole’s event horizon. The concept was devised by the German astronomer Karl Schwarzschild (1873–1916) in 1916. See also death of a star.


Astronomy
  • The radius of the event horizon of a black hole. At the Schwarzschild radius the escape velocity becomes equal to the speed of light. The more massive the black hole, the larger the Schwarzschild radius. For a body of mass M the Schwarzschild radius is 2GM/c2, where G is the gravitational constant and c is the speed of light. It was first calculated in 1916 by K. Schwarzschild.


Space Exploration
  • In astrophysics, the radius of the event horizon surrounding a black hole within which light cannot escape its gravitational pull.

    For a black hole of mass m, the Schwarzschild radius Rs is given by Rs = 2gm/c2, where g is the gravitational constant and c is the speed of light. The Schwarzschild radius for a black hole of solar mass is about 3 km. It is named after Karl Schwarzschild, the German astronomer who deduced the possibility of black holes from Einstein's general theory of relativity in 1916.


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