What is the chance of a collision between the sun and another star?

The chance of a collision between the Sun and another star is extremely low. In our galaxy, the Milky Way, stars are spaced far apart, making direct collisions rare. Estimates suggest that the probability of a star passing close enough to the Sun to cause a significant gravitational disturbance is about once every few billion years. Overall, the vast distances between stars result in a very low likelihood of direct collisions.