" The problem, MacDonald explains, is that distorting spacetime in this manner would take a mind-boggling amount of energy...While the so-called Alcubierre drive could move a bubble of spacetime at any speed, he found that generating a bubble even as small as a few meters in diameter would require an amount of energy comparable to the mass of the sun."
We don't understand everything. We don't know if we can harness zero point energy. We don't really understand a lot of the quantum world.
No one in the 1800s thought a bomb line the nuclear bomb was possible. They would have said you need so much gunpowder that it's not even possible for that big of a bomb.
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