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Recently, the giant impact hypothesis has been considered a more viable scientific hypothesis for the moon's origin than the coformation or condensation hypothesis. The Giant Impact hypothesis holds that the Moon formed from the ejecta resulting from a collision between a very early, semi-molten Earth and a planet-like object the size of Mars, which has been referred to as Theia or Orpheus. The material ejected from this impact would have gathered in orbit around Earth and formed the Moon. This hypothesis is bolstered by two main observations: First, the composition of the Moon resembles that of Earth's crust, though it has relatively few heavy elements that would have been present if it formed by itself out of the same material from which Earth formed. Second, through radiometric dating, it has been determined that the Moon's crust formed between 20 and 30 million years after that of Earth, despite its smallness and associated larger loss of internal heat, although it has been suggested that this hypothesis does not adequately address the abundance of volatile elements in the moon.

2006-10-04 10:31:45 · 3 answers · asked by Anonymous in Science & Mathematics Astronomy & Space

3 answers

It is quite possible. Think about it. The moon has a composition similar to the crust of the earth, and does not have a core as such, meaning it probably did not condense out of a nebula. Also, it has a lack of "refractory" minerals (which are formed at high temperatures", so such high temperatures probably nevery existed in the moon (except locally, where impacts on the moon caused "shock metamorphism". Look at photos of the Uranian moon Miranda. That moon is a patchwork of landforms, most likely the result of it being hit by a very large object, or torn apart by a near miss by a large object, and then pieced itself back together. Uranus, also, has it's axis of rotation tilted by 98 degrees, quite possibly the result of a near encounter with a large object, or an actual collision, maybe the same one that broke up Miranda. So, possibly, such near misses and actual impacts have occurred in other parts of the solar system.

2006-10-04 10:44:34 · answer #1 · answered by David A 5 · 1 0

Another clue is the captured rotation of the moon which equals the time of its orbit around the Earth.
It means that one hemisphere of the moon always faces the Earth, which is consistent with the dynamics of a single body that split in two (unequal) parts.

2006-10-04 18:48:24 · answer #2 · answered by PragmaticAlien 5 · 1 1

You really should give credit to your source: Wikipedia. Word for word......
Note the 5th word in the text: HYPOTHESIS

Try looking THAT up.................

2006-10-04 17:38:06 · answer #3 · answered by Steve 7 · 1 1

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