The Sun were part of a binary star system of two main-sequence stars and Earth orbited around one of the stars, while the other star just slightly changed Earth’s distance of orbit, compared to its...

The Sun were part of a binary star system of two main-sequence stars and Earth orbited around one of the stars, while the other star just slightly changed Earth’s distance of orbit, compared to its orbit today? You might want to discuss such things as climate, tides, impacts from meteoroids and asteroids, and habitability.