Lowell, Percival, 1855-1916 · New York, The Macmillan company · leaf 44
be noticed is that a spiral nebulacould not develop of itself and subsist. To continueit must have outside help. For if it were due to in-ternal explosive action in the pristine body, each ejec-tum must return to the point it started from, or elsedepart forever into space, for the orbit it would… … Nebula M. ioi Urs^ Majorts — after Ritchey. have produced the forms we see, unless they beephemeral apparitions, a supposition their presencethroughout the heavens seems effectually to exclude. 24 THE EVOLUTION OF WORLDS The form of the spiral nebulae proclaims their mo-tion, but one of its…
Cosmogony
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