The most commonly accepted theory for the Moon's creation involves a collision between Earth and a Mars-sized body (Theia) that split off a chunk of the larger body and created an orbiting neighbor. You might have to reconsider that explanation, however. NASA researchers have developed a new model that suggests the Moon is made of the same materials as Earth, not its cosmic nemesis. The approach simulates the processes of the Moon's formation using 14 volatile, metal-loving elements found in samples from the Apollo missions, providing a complex understanding that hasn't been attempted before. The concentrations of those elements could speak volumes about what happened, according to the scientists.