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gamma-ray astronomy

Overview page. Subjects: Astronomy and Astrophysics.

The study of electromagnetic radiation from space at the very shortest wavelengths and with the highest photon energies (see gamma rays). Gamma rays are produced in regions of extremely...

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gravitational collapse

Overview page. Subjects: Astronomy and Astrophysics — Physics.

A phenomenon predicted by the general theory of relativity in which matter collapses as a consequence of gravitational attraction until it becomes a compact object such as a white dwarf, a...

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relativity

Overview page. Subjects: Physics — Astronomy and Astrophysics.

A collective term for two theories, special relativity and general relativity, developed by A. Einstein. The special theory of relativity, published in 1905, is concerned with the laws of...

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Schwarzschild radius

Overview page. Subjects: Astronomy and Astrophysics — Physics.

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...

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