一等星
一等星-
一等星的星最明亮。
Stars of the first magnitude are the brightest .
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星就其光度而分，可分为一等星、六等星等等。
Stars are classified by brilliance as of the first , sixth , etc. magnitude .
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最亮的星球是一等星，那些肉眼刚能看见的星球算是六等星。
The brightest stars are first-magnitude stars while those just visible to the human eyes are sixth-magnitude stars .
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猎户座中的一等星的直径比我们整个太阳系直径的四分之一还要大。
The diameter of the star Betelgeuse is more than a quarter the size of our entire solar system .