Any evidence that large objects have collided with the earth in Ghana?
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YES,
Soon after the Earth coalesced in the early solar system, it was hit by another planet, Theia. The collision formed the moon, but researchers are still trying to piece together exactly what happened, including what happened to Theia. For years, researchers have thought that Theia might have smashed into Earth at an angle, strong enough to obliterate Theia into little bits and create the moon. But that might not be the case. Instead, a recent study suggests that Earth might actually be a chimera of the two planets.
A new paper suggests that instead of a simple sideswipe that crushed Theia into smaller pieces that formed the moon, the impact was more of a head-on collision that was so forceful that it thoroughly mixed Theia and the Earth together, giving both Earth and the newly formed moon a unified geological signature.
The 'giant impact hypothesis' has been floating around since the 1970's, but researchers are still arguing over the exact nature of the collision. Unfortunately, there are no instant replay cameras that date back to that moment in time, so researchers have to content themselves with the next best thing: rocks.
By analyzing rocks from both the Earth and the moon, the researchers found that there was essentially no difference between their oxygen isotopes, indicating the possibility that Theia and the Earth mixed together. The finding directly contradicts results from another paper in 2014 which found evidence that the moon had a distinct isotopic signature, supporting the sideswiping hypothesis.
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