The Earth's moon is unusually large. Two popular theories of the moon's origin include the "sister world" hypothesis, which stat
es that the moon formed from the same materials as the Earth, near enough to the Earth that they fell into orbit around each other. A second theory is the "capture" hypothesis, in which the moon formed elsewhere in the Solar system, and the Earth's gravity pulled it into its orbit. Studies of what the moon is made of indicate that some of its materials had to come from the Earth or from the same area of the Solar system where the Earth had formed. At the same time, the moon does not contain much of the material that makes up the Earth's core, so the moon could not have formed from the same materials as the Earth. How do the two facts above affect the described theories of the moon's origin? A. They show that scientists will never agree on where the moon came from. B. They show that more experiments on moon formation need to be done. C. They show that no theory accounts for the existence of the moon. D. They show that neither theory is complete and entirely correct.
Answer: D. They show that neither theory is complete and entirely correct.
Explanation:
Theory is the set of rules and principles that describe and explain a particular phenomenon (the existence of the moon in this case) and is subject to changes as new evidence emerges that gives meaning to it.
In this sense, there are many theories about the Earth's moon formation and two of the "accepted" theories are described before the question. In addition, both theories explain in a certain way the reason why the Moon is predominantly composed of elements similar to those found on Earth.
However, both theories seem to be incomplete when trying to explain our Moon's origin.
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