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Dark energy is said to be pushing the galaxy apart, but if empty spacetime exists outside the expanding bubble of the universe, the gravity of that spacetime would be pulling it apart instead
I am hoping physicists will read this and consider it.
I think I will address Ur reply next, to clarify this universal/cosmic confusion, once and for all, time.
Hypothesis:Dark matter is the fabric of spacetime itself.When I speak about spacetime, I am referring to the fabric of spacetime.
The mass of spacetime is small. But since a galaxy is mostly empty spacetime, the mass of spacetime at that scale would be large. With the gravity of the matter in the galaxy attracting more spacetime, the mass of spacetime in the galaxy would increase to an equilibrium. This gathers enough spacetime(and its mass) to hold the out most matter in orbit.