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Moon Via NASA Birth of Moon: Have you ever wondered how moon was formed or it came to be as natural satellite of earth. In the history of astronomy, a few handful of theories were posited by various scientist and communities. Some of them were debunked right away and few were pondered for decades. This  theories had a impact so much so that one of the main aims of, NASA's infamous, Apollo missions was to identify the origins of moon. There are many different theories, but these theories can be coalesced to four categories. 1. Giant-Impact  Hypothesis Nasa.gov This is the most popular and widely accepted theory in the community of science. The theory goes like this, Apparently a mars-sized proto planet had collision with proto-earth and the impact expunged part of debris formed from collision to space. But some portion of debris condensed and formed together as moon. This theory explains most of the aspects related to formation of moon such as, angular momentum between earth and s