The object's apparent brightness yields the distance; its redshift yields the velocity.

这些天体的视亮度可以得到距离，它们的红移可以得出速度。

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This is the first study in the world to use the reflection of the Earth to measure the effect of continents and oceans on the apparent brightness of a planet.

这是世界上首次利用地照来研究陆地和海洋对行星表面亮度的影响。 在其他研究中，已经使用色谱和红外传感技术来确认植物以及进行气候监测。

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When viewing extended objects, the apparent brightness seen in the eyepiece is a function only of aperture and magnification, it is not related to focal ratio.

当观察扩展光源时，目镜中所看到的亮度只跟孔径和放大率有关，它跟焦比并没有关系。

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It is similar to a Hertzsprung-Russell (HR) diagram but the latter plots luminosity (or absolute magnitude) rather than just apparent brightness and a knowledge of the distances of the stars plotted is also needed.

ENGADGET: 9-gigapixel image of the Milky Way reminds us just how small we truly are