The first close-up images of Pluto showed active nitrogen ice geysers and a surprisingly young surface.
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The Sun occasionally emits powerful solar flares.
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The Moon's surface is covered in craters.
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Black holes can slow time so much that seconds near them equal years far away.
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The Moon's surface temperature varies dramatically.
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Black holes can slow time so much that seconds near them equal years far away.
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The light you see from some stars today began traveling before humans existed.
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