In the wandering earth, the earth can fly away with its back on fire. Can the earth really fly away, as described in the movie?

Vacuum flame spraying can produce reaction force. Theoretically, a flashlight can react, let alone fire. There is a theoretical basis for using the engine to generate reaction force to make the earth fly away.

No matter how the planetary engine works, as long as it can generate enough thrust, it can push the earth away. And this thrust is not as big as intuitive feeling.

Theoretically speaking, as long as the earth keeps the revolution speed, as long as the earth is a little far away from the sun and breaks the existing gravitational balance of the planets in the solar system, and the gravitational force of the sun is less than the centrifugal force of the earth's revolution, the earth will slowly move away from the sun and eventually fly out of the solar system (of course, without hitting other planets). But the earth will not fly out in a straight line, but spiral away.