网络释义专业释义英英释义
由于宇宙的膨胀，对河外天体测距，一般指光度距离(Luminosity distance)或角直径距离(angular diameter distance)。光度距离其中F是观测到的流量，而L是天体在相对其静止的参考系中的内秉光度。
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Angular diameter distance
- abstract: The angular diameter distance is a distance measure used in astronomy. The angular diameter distance to an object is defined in terms of the object's actual size, x, and \theta the angular size of the object as viewed from earth.
以上来源于: WordNet
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