01 / 3 · TED-Ed
Because these enormous masses all gravitationally tug on each other, our galaxy’s motion is much more helter-skelter than a clean, circular orbit.
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The billions of stars in galaxies are not gravitationally bound to them, instead it is the gravitational effect of dark matter which holds them together.
This means that our Local Group is surrounded by a lot of stuff, but none of those structures and galaxies are gravitationally bound to us.
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