Summer on Uranus lasts for 21 years.
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Mars had an oxygen-rich atmosphere around 4 billion years ago
13
Jupiter's moon Ganymede, is larger than the planet Mercury!
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More than 20 million meteoroids enter Earth's atmosphere every day.
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The moon is actually moving away from Earth at a rate of 1.5 inches per year.
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The Space Shuttle main engine weighs 1/7th as much as a train engine but delivers as much horsepower as 39 locomotives.
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The earth rotates more slowly on its axis in March than in September.
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