When galaxies collide, the most accurate outcome from your list would be:
- Galaxies merge: This is a common result of galactic collisions. When two galaxies come close to each other, their gravitational interactions can lead to them merging into a larger galaxy over time.
The other options are somewhat misleading:
-
Galaxy triple size: This isn't a standard result of a collision; while merging can create larger galaxies, the term "triple size" isn't typically used.
-
Galaxy, destroy their stars: While stars can be disturbed during a collision, they are generally too far apart to directly collide. However, some stars may be ejected from the galaxy or their formations might be affected in denser regions.
-
Galaxies disappear: This is not accurate; galaxies don't disappear, but one galaxy might be assimilated into another.
In summary, galaxies merging is the most relevant and scientifically supported outcome when galaxies collide.