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Why the Moon turns red during a total lunar eclipse

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Whenever you look up at a full moon, you're seeing sunlight that's reflected off the lunar surface. So if something were to block that sunlight, say the Earth, then the moon should disappear from view. But during a total lunar eclipse, when the moon passes through the Earth's shadow, we get a red moon, not a vanishing one. So what's going on? Tech Insider takes a quick trip to the lunar surface.

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