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Despite being the star closer and better known, the origin of the Moon is one of the most controversial issues, with several theories that try to explain.

The model of the Great Crash, is currently the most accepted theory of lunar formation.

Any theory that explains the existence of the Moon, of course, must explain the following facts:

1. The low density of the Moon (3.3 g / cc) shows no core important iron like Earth.
2. Moon rocks contain few volatile substances (eg water), which implies that the lunar surface had a "baked" additional to that of Earth.
3. The relative abundance of oxygen isotopes in the Earth and Moon are identical, suggesting that the Earth and the Moon formed at the same distance from the sun.
4. The Moon is about 4 000 500 million years, a hundred million years younger than the Earth and other Solar System.

There are several theories about the formation of the moon.

Fission Theory:

This theory proposes that the Moon was once part of the Earth and somehow separated at the beginning of the Solar System. If Earth had rotated enough fast, could have lost to the moon on its surface, and that would explain why the composition of the Moon is similar to the mantle of our planet and not the core.

primitive Earth would separate rapidly rotating material of Ecuador, the future moon.

However, there is evidence it should be noted that initial rapid rotation, and this is not true.

This theory does not explain the "cooking" additional lunar materials.

The capture theory:

This theory proposes that the moon formed elsewhere in the Solar System, and was later captured by the gravitational field of Earth. The different chemical composition makes this possible, but against this that the catch in the orbit that is currently highly unlikely.

Nor has an explanation for the "cooking."

Condensation Theory:

This theory proposes that the Moon and the Earth condensed from the same nebula that formed the solar system, and when condensed, it became a rotating around each other. However, if well formed, should have the same composition and structure (iron core) also does not explain the "cooking."

The Great Collision Theory

This is currently the most accepted theory, with a Mars-sized object colliding with Earth, at the time that they were packing. This material ripped from the mantle, many return to Earth, and the larger piece to the moon formed. Computer simulations

put this scenario as entirely possible, as you can see in the video below.

You can see that as the collision is "side", most of Earth's core remains intact. This makes the composition of the Moon is more similar to Earth's mantle, and in fact has almost the same density and chemical composition.

The current orbit is compatible with this event, and also explains the "cooking" additional lunar materials. It also explains why the materials of the moon is a hundred million years younger.

Just this theory has its problems, for example, the Moon should be built with materials from the proto-Earth mixed with material from the impactor. However, the amount of oxygen is almost equal to that of Earth.

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Luna Formation of the formation of lunar maria

One of the most beautiful images that you can have is of the moon through binoculars. The three-dimensional impression he has is impressive.

Area Mare Imbrium, photographed from Apollo 17. Is the area we use for animation below.

Then you go into detail, clear zones, high and very old, heavily cratered, darker areas, less cratered, fairly smooth seas.

The formation of the Seas:

all know that the seas are not acts as ground water, but are made of something solid: basalt.

The most accepted theory of its formation, there is lava on the moon, which flowed on the surface covering the lower zones.

When the moon was just born, it solidified a "scab" fine rocks, which are now seen as lighter areas.

This crust was quite thin, with lava (basalt) below. When an asteroid hitting the surface with sufficient diameter to break the "crust", basalt flowing there, filling the whole region.

is now accepted that the oceans have on average about 20 kilometers thick.

lunar topographic map taken by the Clementine spacecraft, where it is clear that the seas are in the lower areas of the Moon. There

seas are directly related to the collision of an asteroid, such as Mare Crisium ( impact seas), others were formed by filling the region (fill seas).

Below you can see a very basic video on how it is a sea, and as the basalt flows. In the initial image is the original image area, with a land where the future simulated the formation of the Tues

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The Wall of China from the moon?

We've all heard the phrase "the only human construction visible to the naked eye from the moon is the Great Wall of China."

Richard Halliburton, who created the phrase.

has been repeated so often that it has even been published in school books. There is a version more "soft" only said that viewed from the orbit of a spacecraft ....

History

Many think any astronaut said when he went to the moon, but the most accepted version is that it said the writer of adventure (and adventurous) Richard Halliburton.

I wrote in the early 30 ', in the book " Books of marvels, the Orient " long before the man on the moon. This managed to appear in the book of oddities of Ripley, which then was considered as a truth for long.

the end it's true or not? Let

a little more deeply into the situation, from the scientific point of view.

To solve this we know:

1. What is the maximum resolution of the eye
2. The value represents the Moon.
What are
3. the measurements of the Great Wall of China.

1) The Resolution of the eye:

This value is well known for a long time.

The eye can define ('solve' in terminology of telescopes) a minute of arc (if you got good eyesight!).

2) The accounts

The Moon has an average of 30 minutes of arc, and its real diameter is about 3500 km. With the data of point 1) and a simple rule of thumb, we can calculate that 1 minute of arc is 117 km from the moon.

Although the Moon has an elliptical orbit, which sometimes is closer to the maximum definition of the eye to the distance Earth - Moon is about 100 km.

3) Measures for the Wall

La Muralla measures more than 2400 km, and at no time does not exceed 30 meters wide.

are lots of photos of the Great Wall, but I found it very curious, and who have used it as a gateway ....

Conclusion:

Not too hard to answer:

NOT see the Great Wall of China to the naked eye from the moon.

Certainly
currently no human construction is, unless some artificial lake created by a dam, or loss of the forest for the trees cut down fierce, but a "selenite" does not have to assume that these changes are artificial. And

telescope?

bear the thought even further:

With telescope see? What's more: We will be spying from the moon?

The best resolution is achieved with a telescope is 0.3 arcsec (0.3 ") approximately, and is due to seeing .

Although the moon has no atmosphere, the Earth itself so the effect is the same.

Even when conditions are exceptional and can reach 0.1 "implies a definition of 200 meters ...

With a telescope, several meters in diameter and current technology, under certain lighting conditions (dusk or dawn to cast a longer shadow ) and atmospheric stability in the area of \u200b\u200bthe wall, it would start just a glimpse ...

This reasoning applies also to the Moon from Earth: the best pictures you can get from the Moon have a resolution of about 200 meters.

This image shows the maximum that can be done on the Moon from Earth. The French took three amateurs, P. Tosi, E. Rouseet and J. Luc Dauvergne, with a 1-meter telescope from Pic du Midi. The smallest details are less than 300 meters. It is the Alpine Valley region.

To get to see the Wall from the moon as seen in the photo below, which has a definition of 1 meter (0.0005 represents!) Would require a telescope 230 meters in diameter! !

picture from a plane of the Great Wall, at 7000 meters. It has a definition of 1 meter.

As we can see from the ground up details 200 meters, we can rest assured that there can be no selenite taking us out photos with this definition, because we would have seen his telescope 230 meters in diameter! (*)

be seen from the orbit of a satellite?

We stayed pending the issue if viewed from the orbit of a spacecraft.

best thing is the comment of a shuttle astronaut Jay Apt: We

the Great Wall of China. Auque saw small buildings, such as runways, the Great Wall is made of materials with color that is indistinguishable from the surrounding terrain. Despite persistent stories that can be seen from the moon, for us it was invisible from only 180 miles!

(*) This is one I take poetic license. The ever seeing let them see with this definition.