The Earth's magnetic field flips polarity every few hundred thousand years.
Fact #2453
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Some stars appear to dim irregularly for reasons that are still studied.
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Jupiter has a magnetic field stronger than Earth's.
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There are stars older than the Milky Way.
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Mercury has extreme temperature differences.
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The observable universe is about 93 billion light‑years wide.
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The universe is estimated to be about 13.8 billion years old.
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The Hubble Space Telescope has captured deep images of distant galaxies.
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The Earth's rotation speed varies slightly over time.
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