星星(点光源)的亮度只是望远镜孔径的函数-孔径越大，图像越亮。
The brightness of stars (point sources) is only a function of telescope aperture-the larger the aperture, the brighter the images.
上图所示的这一亦称“h和chi英仙座”(“ h and chi Persei ”)的不同寻常的双星星群的亮度高到可以在一个暗处不用双筒望远镜就看到。
Also known as "h and chi Persei", this unusual double cluster, shown above, is bright enough to be seen from a dark location without even binoculars.
正如白昼时天空中没有任何一颗星星的温度和亮度能超过太阳，同样，也没有任何一项竞赛能够比奥运会更伟大。
As in the daytime there is no star in the sky warmer and brighter than the sun, likewise there is no competition greater than the Olympic Games.
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