Question: when is andromeda going to collide with the milky way
Answer: Excluding planetary engineering , by the time the two galaxies collide the surface of the Earth will have already become far too hot for liquid water to exist , ending all terrestrial life ; that is currently estimated to occur in about 3.75 billion years due to gradually increasing luminosity of the Sun ( it will have risen by 35 -- 40 % above the current luminosity ) .