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℃.
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