The stars and their mysteries : an interestingly written account of the wonders of astronomy, told in simple language (1916)
Gibson, Charles R. (Charles Robert), 1870-1931 · Philadelphia : J.B. Lippincott Co. ; London : Seeley, Service & Co., Ltd. · leaf 136
r scale. You willunderstand that in the drawing (Fig. 8) thefour innermost race-courses are represented bythe tiny ring at the centre; that is the sizeof Mars orbit in proportion to the others. 128 IN SPACE Suppose we set out on another trip in ourwonderful flying machine, in order to have alook at… … Fig. 8.—The race-courses of the four planets farthest from the Sun all the time, so that we may form some opinionof their different distances from the Sun. Thenon our homeward run we can take time to havea look at each of the planets. After getting clear of the ocean of air whichsurrounds the…
Astronomy · Stars
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