The Moon has 'moonquakes' caused by tidal forces from Earth — some have registered up to 5.5 on the Richter scale.
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The Earth is not perfectly round.
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Mercury has extreme temperature differences.
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The Great Attractor is a gravitational anomaly influencing the motion of galaxies.
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The light you see from some stars today began traveling before humans existed.
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The heliosphere protects the solar system from interstellar radiation.
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The Earth's atmosphere is layered into troposphere, stratosphere, and beyond.
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The Earth's axis is tilted about 23.5 degrees.
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The observable universe is about 93 billion light‑years wide.
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