What fundamental force acts as the cosmic glue holding stars, gas, and dust in galaxies?
Answer
Gravity
Gravity is fundamentally identified as the cosmic glue responsible for holding the immense, swirling structures known as galaxies together. This pervasive force dictates the motion of every star within its island universe, actively preventing the entire structure from dispersing into the void of intergalactic space. It functions as the mutual gravitational attraction between all mass components, providing the necessary centripetal force to constrain stars to their orbital paths, much like it keeps the Moon orbiting the Earth.
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What Force Binds A Galaxy Together? - Physics Frontier - YouTube
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