The Heavens Above: A Popular Handbook of Astronomy

by J. A. Gillet; W. J. Rolfe

Fig. 433.

375. Double and Multiple Nebulæ.—Many double and multiple nebulæ have been observed, some of which are represented in Fig. 434.

Fig. 434.

Fig. 435 shows what appears to be a double annular nebula. Fig. 436 gives two views of a double nebula. The change of position in the components of this double nebula indicates a motion of revolution similar to that of the components of double stars.

Fig. 435.

Fig. 436.