Irresolvable nebulae

(Astron.) nebulæ of a cloudlike appearance, which have not yet been resolved by the telescope into stars, and are often distant galaxies. See galaxy{2}.
- Sir W. Herschel.

See also: Irresolvable

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
And right from the beginning, they believed that irresolvable nebulae visible in telescopes were Milky Way-like collections of stars seen at great distances.
He speculated that some force, perhaps centrifugal, caused matter to aggregate near the galactic poles, forming irresolvable nebulae but few stars.