Star-land : being talks with young people about the wonders of the heavens (1891)
Ball, Robert S. (Robert Stawell), Sir, 1840-1913 · London ; Paris : Cassell & Co. · leaf 259
than three years, and it gives us some curious in-formation that has been ascertained during its journeys.One of the facts we have thus learned is so important thatwe cannot omit to notice it. (Fig. 71.) At increasing heights above the earths surface thereis gradually less and less air; until at… … The Orbit of Enckes Comet. to breathe in the open space which begins a few hun-dred miles aloft. In open space motion could take placequite freely. Down here the resistance of air is a greatimpediment to movement, especially when very rapid. A Comets and Shooting Stars. 245 heavy cannon-ball is…
Astronomy
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