Astronomy for Young Folks, by Isabel Martin Lewis, Part 7
Boring Books for Bedtime Readings to Help You Sleep
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The History of Comets
Naked eye comets of great splendor and brilliancy are comparatively rare. The majority of all comets observed have come within the Earth's orbit. No known comet has its parajelian beyond the orbit of Jupiter. It is very unlikely any such comet would ever be discovered.
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