Astronomers describe star brightness in terms of magnitude and luminosity.

天文学家用星等和光度来描述恒星的亮度。

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The magnitude scale now runs to more than six and less than one, even descending into negative Numbers - the brightest star in the night sky is Sirius, with an apparent magnitude of -1.46.

现在星等的取值范围已经多过六等，低于一等，甚至下降到负值——夜空中最亮的星是天狼星，它的可视星等为- 1.46。

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The magnitude scale now runs to more than six and less than one, even descending into negative Numbers -the brightest star in the night sky is Sirius, with an apparent magnitude of -1.46.

现在星等的取值范围已经多过六等，低于一等，甚至下降到负值——夜空中最亮的星是天狼星，它的可视星等为- 1.46。

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It glowed like a 4th magnitude star, NASA says, thanks to an explosion equivalent to 5 tons of TNT.

CNN: Bright explosion on moon visible from Earth, NASA says