EPISODE · Oct 8, 2019 · 5 MIN
科学家是怎样知道恒星是由哪些元素组成的？
from 天文随心听｜讲述宇宙与人的故事
我们都知道元素周期表上的每一个元素都有一个特征谱线。当原子被加热后，原子会处于激发态，在电子跃迁回低能态时，会产生特定的发射谱线。当光照射到原子时，原子也会吸收于发射谱线相同波长的吸收线。如果我们观察太阳光中所有单个波长的光，我们就可以通过光谱中的吸收特性找出太阳最外层的元素。
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科学家是怎样知道恒星是由哪些元素组成的？
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