Tidal or Near-collision hypothesis
This hypothesis was the most accepted before the nebular hypothesis. Proposed by James Jeans in 1917. The formation of planets were said to be formed from the close encounter of our Sun and another star. This close encounter would have drawn large amounts of material from both stars. Which means the gravity of each star was pulling the other apart. This material would combine to create planets and would continue to rotate around the Sun. A question I have about this hypothesis is when would these two stars come close to colliding? When are these collisions expected to take place?