Earth is the only terrestrial planet with a large, spherical Moon. Many theories have been proposed to explain this somewhat unusual Earth-Moon system. Which of the following are NOT theories proposed to explain the Moon's formation?
spin-off

the following five theories propose to explain the moon formation;

1.Capture

2.Fission

3.Conformation

4.Colliding planetesimals

5.Giant impact

Explanation:

Capture: some researchers suggest that the moon originally formed elsewhere before being grabbed by the earth gravitational pull.

Fission: this thought is from Charles Darwin's son George, he explain that the material that formed the moon was ejected into space by a molten, fast spinning earth in the early days of the solar system.

Co-formation: It was also possible that the moon formed alongside Earth 4.5 billion years ago, coalescing from dust and gas in the same part of our solar system's protoplanetary disk.