| 单词 | density-wave theory |
| 释义 | density-wave theory [`den·sǝd·ē ´wāv ´thē·ǝ·rē] ASTROPHYSICS A theory explaining the spiral structure of galaxies by a periodic variation in space in the density of matter which rotates with a fixed angular velocity while the angular velocity of the matter itself varies with distance from the galaxy's center. |
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