Why are galaxies different shapes

A galaxy is an enermous group of stars which is held together by the force of gravity. Our own galaxy is called the Milky Way and this is in the shape of a spiral. There are possibly as many as 100 billion galaxies in the universe. Many of them are grouped together in clusters with huge areas of space between them and consequently from many irregular shapes.

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FACT FILE

The Milky Way is a huge disc-shaped collection of billion of stars and interstellar debris. Most of these stars cannot be seen with the naked eye but their combined light produces a huge milky-looking path across the night sky.

resources: Tell me why (Chancellor Press)
image 1: http://wwwcdn.skyandtelescope.com/wp-content/uploads/a-galaxy-cluster_480x274.jpg
image 2: https://www.sciencenews.org/sites/default/files/2017/02/main/blogposts/context_andromeda_galaxy_main_free.jpg

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