The Milky Way's spiral arms are interconnected by gravity from "summary" of The Milky Way by Moiya McTier
The Milky Way's spiral arms are not isolated entities floating independently through space. Instead, they are interconnected by the powerful force of gravity. This gravitational connection is what helps to maintain the structure and stability of our galaxy. As stars and other celestial objects move throughout the Milky Way, they feel the pull of gravity from surrounding objects. This gravitational tug helps to keep the spiral arms connected to each other, preventing them from drifting apart. Without this gravitational link, the spiral arms would not be able to maintain their shape and coherence. The interconnected nature of the spiral arms also plays a role in...
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