3 ms·

Why not?

• krapp 8y ago
  Like FTL, nothing in physics as we understand it, or that we've observed in the universe, allows for even the possibility of anti-gravity. Theories always require some magical fudge-factor like "negative mass" that, as far as we know, don't really exist either, and can't apply to our universe. As far as is known, the only way to generate gravity is mass, and the only way to counteract gravity is to push against it in the other direction hard enough, but that's just rocketry.