The book Astronomy a Populace Handbook was written by author Harold Jacoby Here you can read free online of Astronomy a Populace Handbook book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Astronomy a Populace Handbook a good or bad book?
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A flow of water in canals can be imagined only if we suppose also evaporation of that water into an atmosphere, and subsequent precipitation of it as snow or rain. If this precipitation occurs for some reason principally near the planet's poles, while the evaporation takes place all along the canals, we might imagine the latter to have 223 ASTRONOMY been constructed artificially to carry the water away from the poles, so as to fructify and irrigate the entire planetary surface. When these marki...ngs were first seen by Schiaparelli the weight of observational evidence favored the presence of this water vapor. Such observational evidence is all obtained by means of an instrument called the spectroscope (p. 282). If the solar light reflected from Mars passes through a plane- tary atmosphere containing water vapor, its " spectrum, " as seen in the spectroscope, will show certain bands called water vapor bands. Unfortunately, we cannot observe the Martian light until it has passed through the terrestrial atmosphere, which always contains some water vapor.
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