Some galaxies are billions of light-years away.
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Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
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The light you see from some stars today began traveling before humans existed.
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The Earth's magnetic north pole moves over time.
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The Hubble Space Telescope revolutionized deep-space imaging.
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There are rogue planets drifting through space with no star at all.
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The largest volcano is on Mars.
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Mercury has no substantial atmosphere to trap heat.
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The Earth spins at 1000 mph.
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