The earth was hit by a huge object called "Theia" which led to the moon's formation, the findings showed.
The idea that the moon was a result of such a collision has been called the "Giant Impact Hypothesis".
For the study, scientists studied moon rocks gathered by astronauts nearly a half-century ago in the Apollo 11, 12 and 16 moon missions.
They analysed various kinds of oxygen atoms and found the moon rocks have a different makeup than that of the earth.
The results also suggest that the moon may be a 50-50 mix of material from this object and from the earth.
The study appeared in the journal Science.
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