1630s, "quality of being luminous," from French luminosité or else a native formation from luminous + -ity. In astronomy, "intrinsic brightness of a heavenly body" (as distinguished from apparent magnitude, which diminishes with distance), attested from 1906.
双语例句
1. For a few years its luminosity flared up to about 10,000 times the present-day luminosity of the Sun.
它的亮度有几年一度达到了现在太阳亮度的一万倍左右。
来自辞典例句
2. Mount Battie without losing its definition would take on a blue luminosity.
远处的巴蒂山沉浸在一派蓝茫茫的暮蔼之中,轮廓朦胧.
来自辞典例句
3. Astronomers tacitly assume that stars of the same luminosity and color all have the same mass.
天文学家心照不宣地默认,光度和颜色都相同的恒星具有相同的质量.
来自辞典例句
4. The cloud should then have an infrared luminosity thousands of times the sun's bolometric luminosity.
云的红外光度应为太阳热光度的几千倍.
来自辞典例句
5. The quasars cannot shine for longer than a few million years with their present luminosity.
