Jupiter's moon Ganymede, is larger than the planet Mercury!
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Some asteroids have other asteroids orbiting them.
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Mars had an oxygen-rich atmosphere around 4 billion years ago
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There are approximately 3,500 astronomers in the U.S. - but over 15,000 astrologers.
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It 'snows' metal on Venus.
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Jupiter is bigger than all the other planets combined.
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There is a mysterious and loud radio signal known as 'the space roar' that has yet to be explained.
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