Lowell, Percival, 1855-1916 · New York, The Macmillan Company · leaf 72
he forgot that here no such pressurecould exist. A nebula of compressed gas could nothave an irregular form and would have, in the case ofthe Andromeda nebula, a mass so enormous as to pre-clude supposition. Continuity of spectrum here meansdiscontinuity of mass. The spectral solidity of thenebula… … Nebula N. G. C. 6960 IN Cygnus AFTER Ritchey. tinuous. Thus that of the Andromeda nebula showsvery faint dark lines crossing it, apparently accordantwith those of the solar spectrum and faint bright onesfalling near and probably coincident with those of the 48 THE EVOLUTION OF WORLDS Wolf-Rayet…
Cosmogony
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