Astronomy for Young Folks, by Isabel Martin Lewis, Part 7
Boring Books for Bedtime Readings to Help You Sleep
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The Mystery of Comets
Numberless small meteoric particles are entrapped by the Earth's atmosphere every day. The luminosity of comets is due not only to reflected sunlight, but to certain unknown causes that produce sudden or erratic increases or decreases a brilliancy. Up to the present time, several hundred comets have been discovered. Nearly three-fourths of this number travel in orbits that appear to be parabolas.
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