It is not a galactic nebula like the Coal Sack.

By all the galactic nebulas!

"Then let's go on to another of the galactic nebulae," said Morey, looking out into the almost unbroken night of intergalactic space.

Galactic Nebulae and Interstellar Matter, 1957.

About a decade later (in the midst of the Great Debates), Hubble and Slipher discovered the expansion of universe in the 1920s measuring the redshifts of Doppler spectra from galactic nebulae.

I'd switched off the spotlight, because I wasn't illuminating anything except my knees and various galactic nebulae, and if I threw up in my lap, I didn't care to scrutinize the mess under a high beam.

Ulti-mately we will lead mankind into a universe in which nothing is random, nothing is unknown, all is predictable on every level from the microcosmic to the macrocosmic, from the twitching of an electron to the journeys of the galactic nebulae.