Protogalaxy

In physical cosmology, a protogalaxy is a cloud of gas which is forming into a galaxy. It is believed that the rate of star formation, during this period of galactic evolution, will determine whether a galaxy is a spiral or elliptical galaxy; a slower star formation tends to produce a spiral galaxy.
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When a galaxy is in the process of formation it is known as a protogalaxy. As yet, no conclusive observations have been made of one.