单词 | Hubble classification |
释义 | Hubble classificationnoun Astronomy A simple method of describing the shapes of galaxies, using subdivisions of each of four basic types (elliptical, spiral, barred spiral, and irregular). Hubble’s suggestion that they form an evolutionary sequence is no longer accepted.Come the 1960s, an American astronomer named Halton C. Arp became the champion of galaxies that did not fit the simple Hubble classification scheme....
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