The Earth weighs around 6,600,000,000,000,000,000,000 tons (5,940 billion billion metric tons)!
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Mars had an oxygen-rich atmosphere around 4 billion years ago
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41% of the moon is not visible from earth at any time.
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The Sun and Moon appear to be the same size because the moon is 400 times smaller than the Sun, but 400 times closer to Earth.
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The Earth gets 100 tons heavier every day due to falling space dust.
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Not only are there rogue planets floating through space completely alone, not orbiting any stars, but it’s possible that these pitch-black lonely planets support life.
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In the last 7 years, humanity has discovered 43 potentially habitable planets.
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