Plants can sense gravity through specialized cells called statocytes containing heavy starch grains.
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The Sun will eventually expand into a red giant.
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The expansion of the universe was first observed in the 1920s.
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Black holes can slow time so much that seconds near them equal years far away.
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The Oort Cloud is a theoretical shell of icy objects surrounding the solar system.
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A day on Venus is longer than its year.
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The light you see from some stars today began traveling before humans existed.
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The Vostok 1 mission marked the first human spaceflight.
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The universe is estimated to be about 13.8 billion years old.
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