Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York : H. Holt and company · leaf 481
markable of the nebulae visible inthe northern hemisphere. It is particularly worthy of note, asthere is some reason to believe that it has a proper motion. Cer-tain, it is that the bright star which in the figure is at the left-handTipper corner of one of the squares, and on the left-hand… … Fig. 125.—spiral nebula. The trifid nebula, so called on account of its three brancheswhich meet near a central dark space, is a striking object, andwas suspected by Sir John Hekschbl to have a proper motion.Later observations seem to confirm this, and in particular the threebright stars on the…
Astronomy
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