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Download Cambridge illustrated dictionary of astronomy by Jacqueline Mitton PDF

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By Jacqueline Mitton

Beautifully-illustrated dictionary; a necessary consultant to the universe for astronomers of every age.

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In it he introduced the system of naming the brighter stars in each constellation by Greek letters, which he allocated approximately according to brightness or, in some instances, in order of position on the sky. The idea was soon taken up by others and Bayer’s letters are still in use today. Becklin–Neugebauer object One of the brightest of all astronomical sources of infrared radiation. It was discovered by Eric Becklin and Gerry Neugebauer in 1967 and is located in the ä Kleinmann–Low Nebula, within the ä Orion Nebula.

Black body An object that absorbs all the radiation falling on it. black body radiation The characteristic radiation emitted by a ä black body. How the radiation a black body emits varies with wavelength is affected only by its temperature and can be predicted by quantum theory. The graph of radiation intensity against wavelength is called the Planck curve after the physicist Max Planck, who predicted its shape theoretically. Planck curves are hill-shaped and peak at shorter wavelengths for hotter bodies.

Astrobiology The science concerned with the possibility of living organisms originating in space or on bodies other than Earth. astrograph A historical astronomical telescope designed to take wide-angle photographs of the sky for measuring the positions of stars. In particular, the refracting telescopes constructed for the ä Carte du Ciel project were called astrographs. astrolabe An ancient instrument for showing the positions of the Sun and bright stars at any time and date. Its invention is credited to Greek astronomers who worked in the second century bc.

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