| 单词 | surface brightness |
| 释义 | surface brightnesssurface brightnessLuminosity per unit area on the sky, usually expressed for optical data as magnitudes per square arc second. It is a useful distance-independent property to use in the comparison of low-redshift galaxies (where relativistic corrections are unimportant) because the angular area subtended and the luminosity both decrease with the inverse square of the distance. |
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