| 单词 | holmberg radius |
| 释义 | Holmberg radiusHolmberg radius(holm -berg) The length of the semimajor axis of a galaxy down to a surface brightness of 26.5 magnitudes per square arc second, expressed either in arc minutes, or if the distance to the galaxy is known, in kiloparsecs. It is a useful measurement of the visible size of the galaxy.Holmberg radius[′hōm‚bərg ‚rād·ē·əs] |
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