A galaxy is a system of millions or billions or stars, together with gas and dust, held together by gravitational attraction.
I remember my first time viewing the Andromeda Galaxy. Its light coming to me from 2.5 million light-years away. So many thoughts ran through my head as I thought about all of the potential. The potential other solar systems. The potential other planets. The potential for life.
While it's hard to grasp the immensity, viewing a galaxy is extremely humbling.
Galaxy formation comes in many different shapes and sizes.