Earth's shadow has two main regions: the outer shadow, called the penumbra, and the inner shadow, known as the umbra. The penumbra causes faint dimming that can be hard to notice. But the umbra is much darker. As it sweeps over the moon, the eclipse becomes obvious and the darkened portion spreads until the entire moon is covered.
경복궁도 문 닫게 만든 BTS 광화문 공연… 26만명 몰린다。业内人士推荐免实名服务器作为进阶阅读
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