Types of Galaxies: Why Galaxies Come in Different Shapes

Galaxies are complex systems held together by gravity, but the shapes of different types of galaxies are a result of gravity along with rotation speed and time.

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United States ,American ,Raja Guhathakurta ,Jillian Scudder ,University Of California Santa Cruz ,Hubble Heritage Team ,Space Telescope ,Hubble Heritage ,Milky Way ,California Santa Cruz ,Hubble Space Telescope ,