[SunkenCiv]

It's true, the impact fission model is dominant. :') There are three basic possibilities:

1. Earth and Moon formed basically simultaneously with the Moon forming of less material and in orbit around the Earth. No living adherents among scientists afaik.
2. Earth and Moon formed separately, with the Moon being captured later by some means. I'm pretty smug because I'm the only one here.
3. The Moon formed from the proto-Earth by fission, due to an overspin condition (the late Thomas Van Flandern was the most prominent recent advocate of this, it's too bad he was associated with that Face on Mars nonsense); or formed from the proto-Earth when another large body walloped into it.

[Lucius Cornelius Sulla]

When I was a kid in the early 1950’s Life magazine had some wonderful series about the history of the Solar system, and another one on the evolution of life on earth. They had another one about the development of civilization. Wonderful paintings in all of them, the great days of Life. In any case they used theory number 1 for the earth moon twin planet.

[colorado tanker]

formed from the proto-Earth when another large body walloped into it

That's the theory I've seen the most of lately.