Collisional ring galaxy

A collisional ring galaxy is a type of galaxy that forms a distinctive ring shape after a smaller galaxy passes through a larger galaxy. The collision creates a density wave that pushes stars and gas outward, resulting in a bright, ring-like appearance. This process often triggers new star formation in the ring, making it visually striking. Such galaxies showcase the dynamic and sometimes violent interactions that shape the universe, demonstrating how gravitational forces can reorganize galaxy structures dramatically.