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The sun may be our closest star, but it still holds many mysteries.

Aurora
Aurora
These pink lights in the sky are an aurora, caused by solar particles striking oxygen in Earth's atmosphere.
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The Hot Sun
The Hot Sun
This photo shows how hot the sun's gases are. Red spots are cool. Blue and green spots are hotter.
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Sunspots
Sunspots
The sun's gases shoot up into space, forming arcs around sunspots.
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