How the Moon Formed: Lunar Rocks Support Giant Impact Theory

Giant impacts are thought to have been common in the early Solar System ...

Posts about Giant impact hypothesis written by Steve Drury

May be, with time and new evidences coming in, the picture of the Giant Impact hypothesis will be changed in some form, but the gist would still remain the same.

This giant impact also gave the Earth its axis tilt and velocity of rotation ...

Giant impact hypothesis - WikiVisually

The giant impact theory proponents say that Earth had a companion planet around it, placed at a Lagrangian Point (L5 or L4 supposedly).

So this 'giant impact' theory is our best answer to the puzzle of Moon formation.

Indirect evidence for this impact scenario comes from rocks collected during the , which show ratios identical to those of Earth. The highly composition of the lunar crust, as well as the existence of -rich samples, gave rise to the idea that a large portion of the Moon was once molten, and a giant impact scenario could easily have supplied the energy needed to form such a . Several lines of evidence show that if the Moon has an -rich core, it must be small. In particular, the mean density, moment of inertia, rotational signature, and magnetic induction response all suggest that the radius of the core is less than about 25% the radius of the Moon, in contrast to about 50% for most of the other bodies. Impact conditions can be found that give rise to a Moon that formed mostly from the mantles of the Earth and impactor, with the core of the impactor accreting to the Earth, and which satisfy the angular momentum constraints of the Earth-Moon system.

Evidence for Giant Impact Theory Reasons why this is the best accepted theory, are as follows:

The giant impact hypothesis is that the Moon was created out ..

There remain several unanswered issues surrounding this hypothesis. Lunar oxygen isotopic ratio plots are nearly identical to Earth's, with no evidence of a significant contribution from another solar body. Also, lunar samples do not have expected ratios of volatile elements, iron oxide, or , and there is no evidence to suggest that the Earth ever had the magma ocean implied by this hypothesis.

Comeback of Giant Impact Hypothesis | Answers in Genesis

Computer simulations modelling a giant impact are consistent with measurements of the angular momentum of the Earth–Moon system and the small size of the lunar core ...

03/11/2012 · “Giant impact hypothesis ..

today is that the Earth–Moon system formed as a result of a giant impact a Mars-sized body hitting the newly formed proto-Earth, blasting material into orbit around it, which accreted ...

While the giant impact notion seemed ..

that a large portion of the Moon once was molten, and a giant impact scenario could easily have supplied the energy needed to form such a magma ocean ...

The giant impact hypothesis, ..

Indirect evidence for the giant impact scenario comes from rocks collected during the Apollo Moon landings, which show oxygen isotope ratios identical to ...