If the Earth were slung out of its orbit, away from the Sun's light and warmth, what would happen to its atmosphere? How quickly would it cool? The core and magma would provide some warmth to the surface, but even with our greenhouse gases holding in heat, I assume that everything would turn chilly very quickly. Anyone have any idea what the equilibrium temperature would be? How quickly would it be cold enough to liquify and freeze oxygen and nitrogen? A hundred or thousand years after its escape from our solar system, what would its atmosphere, if any, be like?