If the Milky Way were to collide with the Andromeda Galaxy tomorrow, the effects on our immediate surroundings would not be felt right away. The reason is that galaxies are incredibly vast structures, and the collision process would unfold gradually over a long period of time.
The collision between the Milky Way and Andromeda is actually predicted to occur in about 4 billion years from now, based on current scientific understanding. However, for the sake of your question, let's assume the collision happens tomorrow.
Initially, the galaxies would begin to interact gravitationally, but the distances between individual stars are so vast that the chances of direct stellar collisions would be extremely low. The stars in both galaxies would continue their orbits within the merged system, largely unaffected on human timescales.
Over the course of millions to billions of years, the gravitational interactions would cause the galaxies to merge and form a single, larger galaxy. This process would result in the rearrangement of stars and other celestial objects, as well as the potential ejection of some stars from the merged system.
However, on a human timescale, the effects of the galactic collision would likely be imperceptible. The distance between stars is so vast that the changes in gravitational forces or stellar motion would not be directly noticeable to us. It would require long-term observations over many generations to see significant changes in the night sky caused by the galactic merger.
So, if the Milky Way were to collide with the Andromeda Galaxy tomorrow, the immediate effects would be negligible, and it would take millions to billions of years for the full consequences of the collision to become apparent.