HomeAstronomyHow galaxies form: Theories, variants and growth

How galaxies form: Theories, variants and growth

The universe contains billions of galaxies, of which our own Milky Way is just one. Often thought of as vast agglomerations of stars, which is how they look in photographs, galaxies actually contain other types of material as well, such as gas, dust and dark matter. 

Astronomers know that galaxies began to form soon after the Big Bang, but they don’t yet fully understand the process by which they ended up as we see them today. Here are some of the most promising theories of how galaxies form, how and why they merge, as well as the different varieties of galaxies that have been observed. 

Theories of how galaxies form

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