What is "nebulas"

Usage examples of "nebulas".

The Corridor was the name the Patrol had given one of the larger nebulas in this part of the galaxy and it was, as Galland had said, dangerous even without the mines placed in it by the Ba-am-as.

It was not only the pulsars, not only the gravitational lenses, not only the microwave radiation from the nebulas, not only the giant masses at the galactic center that fooled the observers by their regularity, repetition, the peculiar order of their various impulses.