The Wandering Earth is based on a story by Liu Cixin, the author best known for The Three-Body Problem. In the original story, scientists discovered that the sun is on the verge of turning into a red giant, and when it does, it’ll expand beyond the orbit of Mars, incinerating all of the solar system’s potentially habitable planets. They concoct a desperate plan to move Earth out of the solar system to a new star, Proxima Centauri.