What would shake a galaxy and what would shake the universe?
I'm trying to think of what kind of cosmic event would cause an explosion powerful enough to "shake" or disrupt the whole flow of a galaxy and on that same note what other kind of super cosmic event would have the power necessary to be felt across the known universe?
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Well, since vibrations can't propagate through a vacuum, the 'shaking' would have to be something that can propagate through spacetime. Something like a Gravitational Wave fits the bill.
However, any event that would create a gravitational wave strong enough to shake a galaxy would probably also create a flash of radiation powerful enough to boil every planet within thousands of lightyears, and sterilise everything else.
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