The Families of Stars-星族

The Families of Stars-星族

The Families of Stars

     Astronomers bave been able to classify stars according to colour. They have discovered that stars with different colours have different sizes,and that their surface tempera tures are also different. The larger a star is, the higher surface temperature it has.

     From the above table it can be seen that stars are generally divided into five kinds: blue, white, yellow, orange and red. Blue stars are the largest ones, with a diameter of 16,000,000 kilometres. Their surface tetnperature is also the highest, as high as 25,000℃,Then there are yellow stars, 1,600,000 kilometres in diameter and 6,000℃ in surface temperature. Orange stars are smaller,They have a diameter of 1,000,000 kilometres and a surface temperature of 5,000℃.

     The smallest kind of stars appear red in colOUr. Their diameter is only one-twentieth of that of blue stars, that is, 800,000 kilometres, and their surface temperature is only, 3,000℃.星族

     天文學家能夠按照顏色把星星分類。他們發現不同顏色的星星大小也不同，表面溫度也有差異。星體越大，其表面溫度也越高。

     從上表中可以看出星星一般分成五類：藍、白、黃、橙、紅。藍色的星體最大，其直徑為16000 000千米，表面溫度也是最高的，可高達25000℃。接下來是黃色的星，直徑為1 600 000千米，表面溫度為6000℃。橙色的星較小，直徑為1 000 000千米，表面溫度為5 0000℃。

     最小的星體呈紅色，其直徑只有藍色星體的1／20，就是說800 000下米，其表面溫度只有3000℃。

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