Jupiter's moon Ganymede, is larger than the planet Mercury!
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Lightning strikes about 6,000 times per minute on this planet!
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Some asteroids have other asteroids orbiting them.
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The earth travels through space at 660,000 miles per hour.
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More than 20 million meteoroids enter Earth's atmosphere every day.
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The Earth gets heavier each day by tons, as meteoric dust settles on it.
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The density of Saturn is so low that if you were to put it in a giant glass of water it would float.
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Astronauts get taller when they are in space.
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