|Above: A SpaceX spaceship leaves Earth behind.|
Alcubierre’s engine would exploit that loophole by forcing space in front of itself to rapidly contract, and space behind to rapidly expand - so things behind move away at FTL rates, and the things in front approach at FTL rates...
...but the ship stays (locally) still.
It's like parking a new car on a super-strong travellator that's disguised as road, under a speed camera**: Speed with the travellator, then…
“Officer, that camera’s broken! This car can’t have been speeding, its mileage is zero.”
**In other words: It’d be very, very, hard to pull off.
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