An analysis of the different theories on the origin of the moon

The apparent problem given by the lunar Fe depletion could be addressed by modeling the orbiting ring of material as a compositional filter. Cameron rose to say that he and William Ward were also working on the same idea, but coming at it from a different motivation -- the study of angular momentum in the system -- and that they had concluded the impacting body had to be roughly Mars size a third or half the size of Earth.

How the Moon Formed: 5 Wild Lunar Theories

What were some earlier ideas? However, although Earth and the moon share much of the same material, the moon is much less dense than our planet, which would likely not be the case if both started with the same heavy elements at their core.

Most models suggest that more than 60 percent of the moon should be made up of the material from Theia. Painting copyright William K. Where did the theory come from?

Because the collision could have been more energetic than in the current theory, the material from Earth and the impactor would have mixed together, and both Earth and Moon condensed from the same material and therefore have a similar composition. In order to simulate the formation of a single moon sized body one needs to begin with at least a lunar mass outside the Roche limit.

These would have condensed and formed a ring around the Earth. This impact set the angular momentum for the Earth-Moon system, and gave the early Earth a five-hour day. This molten surface underwent extensive evaporation to hot rock vapor. This led to the Moon being covered with material with the same composition as the satellites, and so Earth.

The final mass of the moon can be predicted by applying a derived formula of the conservation of angular momentum: Liquid iron, if present in the disk system, would form a sub-layer at the equatorial plane of the disk but it would spread at the same rate as the rest of the disk Lunar and Planetary Institute.

What were some earlier ideas? The iron core of the impactor melted on impact and merged with the iron core of Earth, according to computer models. Hartmann For more info: Much of this work was pioneered by a Russian astrophysicist named V. Various mathematical models have been used to try and quantify the entropy production upon shock compression.

Initially it was thought that pressure gradients were instrumental in giving the ejected vapor the extra boost necessary to end up orbiting the Earth. Hartmann Why this is a good hypothesis: Lunar Accretion from the Impact-generated Disk As we have mentioned before, the possible consequence of a planetary impact is the formation of an orbiting disk rather than the direct formation of a body.

All of them using a program based on the simulation of a Protoearth and an Impactor made up of particles of equal mass and fixed smoothing lengths. No extra intervening steps are required to nudge things along.

Why are there 5 theories on the moon's origin?

It would only take orbital periods to finally accrete. Theia, an early protoplanet the size of Mars, hit Earth in such a way that it ejected a considerable amount of material away from Earth. At PSI we have worked with several leading researchers to propose new work or the accretion mechanics using a variant of the PSI planet building model.

In the modern era such millennium-old puzzles have been replaced by scientific exploration that raised no-less challenging questions, which continue to perplex us—even 40 years after man first landed on the Moon.The origin of the Moon and its composition analysis of samples brought from the Moon by the Apollo missions showed otherwise—in terms of composition, the Earth and Moon are almost twins.

The theory of tides is the application of continuum mechanics to interpret and predict the tidal deformations of planetary and satellite bodies and their atmospheres and oceans (especially Earth's Ocean) under the gravitational loading of another astronomical body or bodies (especially the Moon.

In the 's, Dr.

The origin of the Moon and its composition

Robin Canup wrote a Ph.D. dissertation on the moon's origin and the giant impact hypothesis, which produced new modeling of the aggregation of the debris into moonlets, and eventually, into the moon itself. A New Theory for the Moon’s Origin.

by Dr. Danny R. Faulkner on March 20, Share: Email Using: Gmail Yahoo! Outlook Other. Evolutionary scientists invoke a completely different scenario for the origin of the many other natural satellites in the solar system.

Supposedly, only the earth’s moon formed by glancing collisions with the. Where did the Moon come from? Answer: The Moon's different chemical composition could be explained if it formed elsewhere in the solar system, however, However, ina conference devoted to lunar origin prompted a critical comparison of the existing theories.

The giant impact theory emerged from this conference with nearly consensus. 4 theories about how the moon formed philosophers and artists throughout history. According to the capture theory, the moon traveled about the solar system before getting stuck in Earth's.

An analysis of the different theories on the origin of the moon
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