In one of Elon's video interviews with The Everyday Astronaut where they are staggered at the sheer scale of Starship, the booster and the launch/landing system

In one of Elon's video interviews with The Everyday Astronaut where they are staggered at the sheer scale of Starship, the booster and the launch/landing system, Elon said "We're not violating and laws of physics here... there's no reason this won't work". Also: "Here at SpaceX we specialize in turning the impossible into just late".