The Earth's magnetic field flips polarity every few hundred thousand years.
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The Earth's atmosphere protects life by filtering harmful radiation.
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Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
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Exoplanets have been discovered in habitable zones around distant stars.
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The Kuiper Belt contains many icy bodies beyond Neptune.
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Neptune is known for its deep blue color.
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The Earth's rotation speed varies slightly over time.
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The Bell Labs experiment led to the discovery of the cosmic microwave background.
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The Milky Way is just one of billions of galaxies in the universe.
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