Star collisions are occasionally observed, particularly in the centre regions of our galaxy dense stars. Every galaxy likely has a black hole at its core, around which massive star clusters orbit. These areas are where star collisions are most likely to happen.
What happens if stars collide ?
In the densest regions of our galaxy, towards the core, especially in enormous globular star clusters, stars collide. Similar to an automobile accident, the outcome of the collision relies on how quickly the stars are travelling relative to one another.
The "fender bender" causes the two stars to merge into one new, more massive star that we term a blue straggler since stars in star clusters move rather slowly. Given that they are hotter and brighter than the other stars in the cluster, we can pretty easily recognise these stars.
The centre of galaxy resembles an interstate, and the stars there are travelling very swiftly. There, a collision is significantly more damaging, and the aftermath is frequently merely "star bits" scattered throughout interstellar space.
The most thrilling collisions occur when a star collides with the primary black hole in galaxy. Despite the inevitable demise of stars, it does so in a spectacular occurrence known as a tidal disruption. While some of the star material is lost, the remainder enters the black hole and condenses into a hot disc of gas before being swallowed.