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Springtime night lights: Finding the aurora
St. Patrick's Day, 2015, brought a once-a-decade display of the aurora, here in "shamrock green."
Credit: NASA
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Iceland is a common place to see the aurora borealis.
Credit: Moyan Brenn/Flickr
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This red aurora, which happened on Oct. 24, 2011, stretched from Chicago to Alabama.
Credit: Tobias Billings
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Light from the aurora is emitted by atmospheric gases when they're hit by particles from space.
Credit: Analogick/Flickr
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Scientists launched a rocket-borne experiment into the northern lights to learn more about them.
Credit: NASA
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An aurora viewed from the International Space Station on Aug. 29, 2014.
Credit: NASA
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