Winchell, Alexander, 1824-1891 · Chicago, S.C. Griggs and company · leaf 73
e seem to be undergo-ing a transition from the spiral to the annular form. H. 604 (Figure 9) is one ofthese. Another equal-ly transitional is H.854 (Figure 10), inwhich we see severalsegments of spiral orannular forms sur-rounding a bright nu-cleus, as in H. 604.The spectra of thesenebulae are also… … NEBULA. 45
Nebular hypothesis · Cosmogony
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