The observable universe contains hundreds of billions of galaxies.
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The Earth's gravity keeps the Moon in orbit.
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The Earth's rotation is gradually slowing over time.
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The International Space Station orbits Earth roughly every 90 minutes.
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The Earth's atmosphere is layered into troposphere, stratosphere, and beyond.
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Neutron stars are among the densest objects in the universe.
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Jupiter is the largest planet in the solar system.
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The Moon's surface temperature varies dramatically.
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The Pioneer 10 spacecraft was the first to travel through the asteroid belt.
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