The Moon completes an orbit around Earth in about 27 days.
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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 Moon's gravity affects ocean tides.
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The Pioneer 10 spacecraft was the first to travel through the asteroid belt.
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There are rogue planets drifting through space with no star at all.
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The Moon's gravity influences ocean tides.
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Jupiter has a magnetic field stronger than Earth's.
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The Earth's gravity affects the movement of tides.
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The light you see from some stars today began traveling before humans existed.
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