GR doesn't explain it's possible, It theorizes it. It's easy to throw stuff around and speculate and make the math work but practically speaking on a macro scale nothing of mass can achieve the velocity to go faster than light. All these theories need some sort of "exotic" energy to make things work.
The energy of Suns in localized space is going to create massive gravitational fields that need to be shaped by this exotic energy and sorry to say, that might be possible in solving GR equations, it just isn't possible in practice
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