银河形态[Galactic Morphology] - 达人(其实～我是卧底，来自外星)

2005/03/23 | 银河形态[Galactic Morphology]
类别(¤〖天文〗) | 评论(0) | 阅读(39) | 发表于 14:24: Barred spirals are classified as SBa, SBb, SBc. Elliptical galaxies are classified as E0 (spherical)-E7 (highly elliptical). Irregulars are denoted (Irr), ovals with no obvious spiral arms S0, peculiar P, and spiral galaxies as Sa, Sb, and Sc, where Sa have large nuclei with tightly bound spiral arms and Sc have small nuclei with loosely wound arms. Approximately 70% of galaxies are elliptical, 15% are irregular, and are spiral.; 0