Luna's Creation

As promised, in a few days there will be a Full Luna, but I will not be able to write anything over the course of this weekend, so that is why this post is earlier. There are about four studied theories of how Luna was formed/captured into Her actual position.

1. Fission Theory, which explains that somehow the Earth's centrifugal forces caused a big chunk of Earth's body to be released into space, leaving behind a scar - which presumably is the Pacific Ocean. This theory is likely wrong as the Earth's initial spin should have been immense and Luna should have followed the Earth's equatorial plane, and this is not the case.
2. Capture Theory explains that Luna was formed elsewhere and traveled into the Earth's gravitational field, capturing it into Her actual position. This one is also highly improbable.
3. Co-formation Theory explains that Luna was formed alongside the Earth but this does not explain the depletion of metallic iron on Luna.
4. Giant Impact Theory explains that a Mars-sized object crashed into a protoEarth about 4.5 billion years ago, fusing both planets and the expelled material that resulted form the crash collapsed into what we know as Luna.

Several models have been developed to study these theories and the only one that explains the angular momentum of the Earth-Luna system is the Giant Impact Theory, also known as the Big Splash. There are still some questions regarding this theory as the sizes of the crashing protoplanets is (and I guess will always be) unknown as well as the amount of material from both protoplanets formed Luna.