Mars had an oxygen-rich atmosphere around 4 billion years ago
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Pluto is smaller than Russia.
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Approximately 115 tons of ocean salt spray enters the earth's atmosphere each second.
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If you were to cry in space, the tears would form a bubble in your eye until it's so big it moves to another spot on your face.
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Summer on Uranus lasts for 21 years.
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The Earth weighs around 6,600,000,000,000,000,000,000 tons (5,940 billion billion metric tons)!
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Lightning strikes about 6,000 times per minute on this planet!
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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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