A day on Mercury lasts about 59 Earth days, but a year there lasts only 88 Earth days.
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The Oort Cloud is a theoretical shell of icy objects surrounding the solar system.
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Comets can develop long tails when near the Sun.
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The Sun will eventually expand into a red giant.
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The Yellowstone supervolcano is one of the largest volcanic systems in the world.
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The Sun occasionally emits powerful solar flares.
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The Voyager 1 spacecraft is the farthest human-made object from Earth and still communicates with us.
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