How to born moon ? according to fission theory
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The Moon has been a constant source of wonder and fascination throughout mankind’s’ history, but despite being located a mere 238,900 miles or 1.28 light-seconds away, we know less about it and how it came to be than we do about objects that are hundreds, or even thousands of millions of light years distant. So while investigations into the Moon’s origin are continuing, let us look at some of the leading theories about how the Earth’s natural satellite came to be.
Giant-impact Hypothesis
1) Collison of Mars-size Object with Earth
The leading theory on the Moon’s formation holds that a large impactor about the size of Mars, called Theia, collided with the young Earth, and in the process tore out a large amount of material which is said to have settled in an orbit around Earth. Eventually, it condensed to form the Moon as we know it today, with this putative collision also credited with having tilted Earth’s axis by 23.5 degrees, thus giving us the seasons. However, one major problem with this approach is that the Earth and the Moon are practically identical in terms of composition.
The Moon was Captured
Tie theory holds that the Moon was captured by Earth as it drifted through the solar system. However, observations have revealed that close encounters with Earth results either in an altered orbit, or a violent collision. The biggest issue with the capture theory is that it cannot explain the capture mechanism. For instance, for this theory to work, the nascent Earth must have had a dense and extensive atmosphere around it at the time of the supposed capture of the Moon, and it must have been dense enough for it to slow the Moon down sufficiently to prevent either a collision, altered orbit, or the escape of the Moon. No evidence of such an atmosphere has ever been found, and as a result, the capture theory was discarded after the mid 1980’s.
In fact this theory was widely accepted up and to the Apollo era, when investigations into the lunar material returned to Earth showed that this material does not consist of oceanic crust, but of material formed in the Earth’s mantle during the Precambrian epoch. Interestingly, the Fission Theory holds that the Pacific Ocean Basin represents the scar of the fission event, and even though the Pacific Ocean floor is only 200 million years or so old, this fact alone does not disprove the theory, since it can account for the similar compositions of the Moon and Earth. Nonetheless, the fission theory cannot explain the Earth–Moon system’s angular momentum.
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