I know it's impossible to move faster than light, this is merely hypothetical.
When you move faster than light, you have infinite mass. Now, surely if that thing with infinite mass crashed into anything, wouldn't an infinite force would be produced (F=MA) ?
And wouldn't that force kinda fuck shit up?
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No one knows, and AFAWK, no one will ever know. True FTL travel is impossible. As far as ascertaining what happens if the impossible were to occur, we can't give anything other than a carefully worded SWAG ([i]Scientific Wild Ass Guess[/i]).