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THE INITIAL CATASTROPHE
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Advanced spectroscopic means reveals that the spectra of these "white" nebulæ are not simply continuous.
Nebula N. G. C. 6960 in Cygnus After Ritchey.
Thus that of the Andromeda nebula shows very faint dark lines crossing it, apparently accordant with those of the solar spectrum and faint bright ones falling near and probably coincident with those of the
