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Hubble sequence : ウィキペディア英語版
Hubble sequence
The Hubble sequence is a morphological classification scheme for galaxies invented by Edwin Hubble in 1926.〔 It is often known colloquially as the Hubble tuning fork diagram because of the shape in which it is traditionally represented.
Hubble’s scheme divides regular galaxies into 3 broad classes - ellipticals, lenticulars and spirals - based on their visual appearance (originally on photographic plates). A fourth class contains galaxies with an irregular appearance. To this day, the Hubble sequence is the most commonly used system for classifying galaxies, both in professional astronomical research and in amateur astronomy.
==Classes of galaxies==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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