It would be tricky without Gravity. They would have to use plasma torpedoes, and it would take longer. But yes, the Death Star would go down.
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Or they can just send a fleet of super carriers
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Empire=Rekt
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And if that doesn't kill it all they have to do is the UNSC infinity or forward unto dawn to kill off the rest
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The Infinity could solo the Star Destroyers. Forward Unto Dawn is just a Frigate. Nothing special about it.