Titan, Saturn's largest moon, has lakes and rivers made of liquid methane and ethane instead of water.
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The Earth is not perfectly round.
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The Yellowstone supervolcano is one of the largest volcanic systems in the world.
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The observable universe is about 93 billion light‑years wide.
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Cosmic microwave background radiation is evidence of the early universe.
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Space is completely silent.
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The Hubble Space Telescope revolutionized deep-space imaging.
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