半人马座阿尔法星：人马座中的聚星，其三个组成部分是星座中最亮的部分，距地球4.4光年。
A multiple star in Centaurus whose three components represent the brightest object in the constellation, 4.4 light-years from Earth.
一般来讲，一个星座中最亮的星编号为α，作为它学术名称的一部分；
Usually, the brightest star in a constellation is has "alpha, " the first letter of the Greek alphabet, as part of its scientific name.
但是毕宿五是个例外，它是整个毕宿星云中最亮的星星。它与其它的星星的距离就近多了，只有65光年，而且它不是这个星星串中的一部分。
The exception is Aldebaran, the brightest star of the V-shaped Hyades, which at about 65 light years is much closer and not part of the cluster.
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