Great Changes: Starting from the Great Collision of Galaxies

According to astronomers' observations, the Milky Way and Andromeda will collide in 3.57 Billion years. At that time, the solar system was still there, but the earth or humans on the earth should not exist. So has any other life observed the collision of these two galaxies? I think there should be. What would it look like when two galaxies collided? I don't know, but I think something magical is going to happen. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.