| 单词 | galaxy |
| 释义 | galaxy A vast collection of stars, dust, and gas held together by the gravitational attraction between its components. Galaxies are usually classified as elliptical, spiral, or irregular in shape. Elliptical galaxies appear like ellipsoidal clouds of stars, with very little internal structure apart from (in some cases) a denser nucleus. Spiral galaxies are flat disc-shaped collections of stars with prominent spiral arms. Irregular galaxies have no apparent structure or shape. The sun belongs to a spiral galaxy known as the Galaxy (with a capital G) or the Milky Way System . There are some 1011 stars in the system, which is about 30 000 parsecs across with a maximum thickness at the centre of about 4000 parsecs. The sun is about 10 000 parsecs from the centre of the Galaxy. The galaxies are separated from each other by enormous distances, the nearest large galaxy to our own (the Andromeda galaxy) being about 6.7 × 105 parsecs away |
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