Theia is a hypothesized ancient planetary-mass object in the early Solar System that according to the giant impact hypothesis collided with the Early Earth around 4.533 billion years ago (BYa).According to the hypothesis, Theia was anEarth trojan about the size of Mars, with diameter approximately 6,000 km (3,700 miles); if the impact were not glancing, it could have destroyed Earth. Models of the impact propose that Theia's debris gathered together around Earth to form what was the early Moon. After the debris from the collision flew into space, some scientists think that it originally formed two moons which later merged to form the single Moon we know today. However, the two-moon hypothesis is not necessary to explain the difference in the faces of the near and far sides of the Moon. The theory also explains the reason that Earth's core is larger than it would be for a body its size, since according to the theory, Theia's core and mantle mixed with Earth.
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- Nitish kumar