4.5 Billion years ago Earth's moon was created by a collision of two bodies, Earth and a planet called Theia. But the collision did more than just create the moon. There is a theory stating the collision with Theia ended up fusing with the Earth, synthesizing both the moon and Earth. While scientists have known that the moon was created by a collision, that theory is not so "new." In the past, Scientists have theorized the planet Theia just swiped the Earth continuing out into the void of space.
A research team in California suggests that Theia never left. In order to confirm this hypothesis, the team analyzed lunar rocks brought back by the Apollo Lunar mission, as well as volcanic rocks from Hawaii and Arizona. If Theia glanced by the Earth, as the impact theory suggests, the moon would be made up of mostly Theia and Earth and the Moon would have different chemical structures.
Actually, researchers found something much more remarkable when comparing the chemical structures of Earth and the moon. The Earth and moon’s oxygen isotopes are indistinguishable, they do not see any difference between the two. This finding suggests the two celestial bodies collided with head on with Theia becoming large parts of Earth and the moon.
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