The Earth's core temperature rivals the surface of the Sun.
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The observable universe is about 93 billion light‑years wide.
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The Moon's gravity affects ocean tides.
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The Earth's magnetic field helps prevent atmospheric loss.
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Light from distant galaxies shows us the past.
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The observable universe is about 93 billion light‑years wide.
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The Voyager 1 spacecraft is the farthest human-made object from Earth and still communicates with us.
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Asteroids vary widely in size and composition.
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The Earth's atmosphere gradually fades into space.
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