Gravity plays a key role in shaping galaxies from "summary" of The Milky Way by Moiya McTier
Gravity is the force that holds galaxies together. Without gravity, galaxies would not exist in their present form. This force is what keeps stars bound to each other, preventing them from flying off into space. Gravity is like the glue that holds everything in a galaxy in place. As galaxies form, gravity plays a crucial role in determining their shape and structure. It pulls matter together, causing it to clump and form the familiar spiral arms or elliptical shapes that we see in galaxies. Without gravity, galaxies would not have the distinct shapes that we observe. In addition to shaping the overall structure of galaxies, gravity also influences the movement of stars within them. Stars orbit around the center of a galaxy due to the gravitational pull of the massive black hole that typically resides there. This creates a dynamic and complex dance of stars moving around each other under the influence of gravity. Furthermore, gravity is responsible for the interactions between galaxies. When galaxies come close to each other, their gravitational forces can cause them to merge or interact in other ways. This can lead to the creation of new stars and the reshaping of the galaxies involved.- Gravity is a fundamental force that shapes the universe as we know it. Without gravity, galaxies would not be able to form, and the universe would look very different. It is truly remarkable to think about how something as simple as gravity can have such a profound impact on the structure and evolution of galaxies.
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