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English
[en]
Astronomers divide these stars into classes 0, I, II and III, according to how much infrared radiation the stars emit.
Korean
[ko]
천문학자들은 이 별들을 0등급, I등급, II등급 그리고 III등급으로 나눴는데, 이것은 별의 적외선 방사량에 따라서 나뉜 것이다.
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