the large concentration of gas and dust from which a galaxy is formed.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use protogalaxy in a sentence
By accounting for stars obscured by dust, Rix estimates that the protogalaxy is between 50 million and 200 million times as massive as the sun.A protogalaxy in the Milky Way may be our galaxy’s original nucleus | Ken Croswell | September 21, 2022 | Science News
British Dictionary definitions for protogalaxy
a cloud of gas in the early stages of its evolution into a galaxy
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012