Theia is a hypothesized planetary body that is thought to have existed in the early solar system. It is primarily known for its role in the giant impact hypothesis, which explains the formation of the Moon. According to this hypothesis, Theia was a Mars-sized planet that collided with the early Earth approximately 4.5 billion years ago. The collision was so intense that a significant amount of material from both Theia and the Earth was ejected into orbit around our planet.
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