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PBS趣味科普

In the early 1900s, astronomer Henrietta Swan Leavitt realized a class of stars called Cepheids pulsate, bright and dim, and every Cepheid that pulsates at the same rate has the same brightness.

1900 年代早期,天文学家 Henrietta Swan Leavitt 发列名为造父变星,它有规律地变亮和变每个造父变星以相同的速率脉动就会有着相同的亮度。

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Einoplas, Einstein, Einsteinian, einsteinium, einstellung, EIO, EIP, EIR, Eire, eirenic,

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