The universe's matter is roughly 5% ordinary matter, 27% dark matter, and 68% dark energy.
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Venus rotates in the opposite direction of most planets in our solar system.
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Comets are made of ice, dust, and rocky material.
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The International Space Station travels at about 28,000 kilometers per hour.
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There are black holes at galaxy centers.
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The expansion of the universe was first observed in the 1920s.
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The Moon has lower gravity than Earth.
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The Moon's gravity influences ocean tides.
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