Earth’s Mantle May Contain Evidence of a Planetary Collision that Formed Our Moon
<p>Astronomers have several theories on why Earth has a moon, although one is much more widely accepted than the others. The first is known as the fission theory, which states that the Moon may be a piece of Earth that broke off during its formation due to speedy rotation. Similarly, another theory called the co-creation theory suggests that the Moon formed at the same time as Earth out of the same material. Both of these theories tend to be overlooked, as the Moon’s composition is not similar enough to Earth’s.</p>
<p>Another theory of lunar formation is the capture theory. The basic idea is that the Moon was already formed and simply pulled into orbit by Earth’s gravity during a close encounter during the formation of the solar system. The main flaw with this theory is that capturing an object as large as the Moon would’ve been essentially impossible.</p>
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