Theia: The Mysterious Planet Struck by Earth, Leading to the Moon’s Formation

Next time you gaze at a full moon, take a moment to remember ‘Theia.’ Around four and a half billion years ago, Earth collided with an imaginary planet that scientists have named Theia. The colossal impact is believed to have ejected debris that eventually coalesced to form the Moon. According to this theory, had Theia not ‘sacrificed’ itself, our natural satellite, the Moon, would not have come into existence, and reading this article would have been far more difficult for you.

Scientists suggest that in the early days, Earth collided violently with a body roughly the size of Mars. The debris from this massive collision gradually came together to form a new Moon, according to the ‘Giant Impact Hypothesis.’ This hypothesis posits that the relationship formed after such an impact played a crucial role in the emergence of life on Earth.

For billions of years, the Moon has maintained a gravitational tug-of-war with Earth, stabilizing its axial tilt as it orbits our planet and providing a stable climate system. “Without climate stability, we would experience extreme weather and seasonal patterns that would not support the development of life,” explained Professor Thorsten Kleine from Germany’s Max Planck Institute for Solar System Research.

Professor Kleine was part of an international research team that, in November of last year, conducted a study delving into this potentially catastrophic and enigmatic event experienced by Earth. Published in the journal Science, their research involved chemical analyses of materials from both Earth and the Moon, further reinforcing the idea that during the turbulent formation of the solar system, Earth and Theia were uneasy neighbors in close proximity.