What would happen to earth if our galaxy were to collide with another?

Since stars are so far apart, there is very little chance that our solar system will collide with another. The main difference would be how our galaxy's sky would appear and how our solar system's orbit would change due to the increased gravity from a more massive core, but nothing would significantly impact our lives on Earth. There's no guarantee that we would survive, but the likelihood of anything catastrophic happening is very low.

A galactic collision, also called a merger, would probably occur if our galaxy and another, like the Andromeda Galaxy, collided. The vast distances between the galaxies would prevent stars from colliding, but the gravitational interactions between them would cause distortions in their shapes and structures. The collision would cause intense star formation, which would result in the creation of new stars and possibly cause some stars to be ejected from the merged galaxy. The Solar System, including Earth, would probably survive the collision relatively unharmed, though its location within the combined galaxy might change.