The formation of the Earth-Moon system has long been theorized to have been heavily influenced by the impact of a Mars-sized celestial body, commonly called "Theia" by scientists. The Moon's formation is theorized to have occurred when this object struck the primordial Earth, spinning off a portion of it's mass, that formed into the Moon as we know it today. However, a common question has dogged the issue since it's conception: did Theia just strike a glancing blow to the primordial Earth, or did it strike it head-on?
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