The origins of stars of differing spectral types must be dissimilar.

不同光谱型星的起源必然是不一样的。

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A convenient classification of stars is based upon the observed sequence of spectral types.

一种实用的恒星分类法是基于测得的光谱类型序列。

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In order to obtain higher measured accuracy of star's positions by the low-latitude meridian circle, it is needed to measure the astronomical refraction to the stars of different spectral types.

提出在低纬子午环上，对不同光谱型的天体测定出天文折射，以提高星位测定的精度。

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The small size of the red dwarf stars, typically with spectral types K and M, gives a greater relative drop in brightness when low-mass planets pass in front of them, making it easier to search for planets around them.

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