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27: How to Build a Galaxy
The Supermassive Podcast
How Does a Galaxy Form?
In the very early universe, there weren't any galaxies at all. The raw material and gas that would come together to form the galaxies was all there. And so we just had to kind of get it all into one place - gravity. If you have a little bit of a density enhancement somewhere, that's going to attract material from around it. That will then in turn attract more material. So you end up pulling the material together, the gas that's being pulled in will start turning into stars. And there you've made a galaxy.
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