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Galaxy - Wikipedia, the free encyclopedia |
 | | A slightly more extensive description of galaxy types based on their appearance is given by the Hubble sequence. |
 | | Since the Hubble sequence is entirely based upon visual morphological type, it may miss certain important characteristics of galaxies such as star formation rate (in starburst galaxies) or activity in the core (in active galaxies). |
 | | Our own galaxy, the Milky Way, sometimes simply called the Galaxy (with uppercase), is a large disk-shaped barred spiral galaxy about 30 kiloparsecs or a hundred light millennia in diameter and three light millennia in thickness. |
| en.wikipedia.org /wiki/Galaxy (2686 words) |