Wiktionary
n. A cloud of gas which is starting to form a galaxy.
Wikipedia
ProtoGalaxy is a cross-genre video game for Microsoft Windows that was released on October 6, 2010. In the game's back-story, a species of powerful, unknown extraterrestrials enters the Milky Way with the intention of enslaving its inhabitants. The player characters must defend Earth from this alien threat and restore human civilization. ProtoGalaxy is a 2.5D game; the 2D playing field employs 3D graphics. ProtoGalaxy incorporates elements of a variety of gaming genres, such as adventure, arcade, shooter, puzzle, and role-playing genres.
This indie PC game is the debut production by Source Studio, a Newfoundland-based company. The idea for the game was originally conceived in 2007 when Alex Brown, Rob Rees, and Albert Chaulk, the three co-founders of Source Studio, were engineering students together at Memorial University.
Usage examples of "protogalaxy".
Other protogalaxies with weaker gravity or less initial rotation flattened very little and became the first elliptical galaxies.