The Sun will eventually become a red giant and engulf Mercury, Venus, and possibly Earth in about 5 billion years.
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The Earth's atmosphere gradually fades into space.
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The Kepler mission searched for Earth-like exoplanets.
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The Earth's magnetic field protects against solar 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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The Earth's magnetic field helps prevent atmospheric loss.
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The International Space Station is one of the most complex engineering projects ever built.
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The Sun accounts for more than 99% of the mass of our solar system.
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Black holes can slow time so much that seconds near them equal years far away.
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