Extra-galactic nebulae

by Edwin Hubble

Transcriber’s Note

Cover image was created by transcriber using an image of the irregular nebula N.G.C. 4214 contained in Plate XIV. The cover is placed into the public domain.

EXTRA-GALACTIC NEBULAE[1]

By EDWIN HUBBLE

[Transcriber’s Note: This etext was produced from
The Astrophysical Journal, Vol. LXIV, pp. 321-369, 1926.]