| 单词 | Hydra I cluster |
| 释义 | Hydra I cluster [¦hī·drǝ ´wǝn `klǝs·tǝr] ASTRONOMY A large cluster of galaxies with recession velocities around 3500 kilometers (2200 miles) per second, part of the Hydra- Centaurus-Pavo supercluster. |
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