A supernova explosion can briefly outshine an entire galaxy of hundreds of billions of stars.
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The Earth spins at 1000 mph.
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The Earth's orbit around the Sun is slightly elliptical.
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Magnetars have extremely powerful magnetic fields.
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The light you see from some stars today began traveling before humans existed.
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The Moon was formed billions of years ago.
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Space is completely silent.
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There are black holes at galaxy centers.
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Mercury has no substantial atmosphere to trap heat.
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