Moon

When we look at the sky, stars form figures which do not change during the centuries. We can thus say that all the stars are fixed the some with regard to the others in our vision in the bare eye. However a small group of 5 objects, besides the Moon and besides the Sun, is nomads and move with regard to stars,

they are planets ("errant" Greek meaning). These 7 "errant" will give moreover their names in the 7 days of the week. Moon, Mars, Mercury, Jupiter, Venus, Saturn, Sun. With the modern telescopes we can observe the "errant" of the "errant". They are the satellites of planets, and there is a lot.

With the exception of Mercury and Venus, all the planets of the solar system possess natural satellites considered as the moons. In the solar system, we distinguish more than 140 from it today.

The Moon with one L capital letter, always has was a center of major interest for the man. The origin of the Moon is the object of a scientific debate. Several hypotheses are advanced, the capture of an asteroid, the fission of a part of the earth by the centrifugal energy, the co-accretion of the original matter of the solar system. Given the slope of the lunar orbit, it is not very probable that the Moon forms at the same time as the Earth, or that this one captured the Moon. The best accepted hypothesis is the one of the huge impact: a collision between the young Earth and the object of the size of Mars would have ejected some matter around the Earth, which would have eventually formed the Moon which we know today.

The most brilliant both celestial bodies

category :  satellites of planets

The most brilliant both celestial bodies of the night-sky seemed to touch in the evening of May 19th, 2007, the Moon and the planet Venus were visible in the same part of the sky, and at the time of their biggest nearness were separated only from a degree of bow. The conjunction appears here such as it was visible since the neighborhood of the city of Quebec in Canada. Venus is situated in the western South of the Moon. The arrows that seems to hurl Venus are in fact egrets of diffraction provoked by the optics of the camera. The image is besides so net as it reveals the presence of the lunar craters. The distance which really separates these two celestial bodies was about 250 million kilometers and this visible nearness, called a conjunction, is only an illusion of perspective. Although the Moon so exceeds Venus every month, a visible passage so moved closer in the evening is relatively rare.
 

The various theories on the origin of the Moon in competition up to the edge of the spatial era were worsened by the results of the analyses of the lunar rocks.
The analysis of the lunar rocks advances an interesting theory on the origin of the Moon. These materials result from the coat of two global accomplices. A gigantic shock has of to shake the quite young Earth. The partner of our nights could arise from the accretion of materials ejected during a tremendous collision.

Let us imagine that at the beginning of the creation of the Earth, a planet very big of the size of Mars (half of the size of the Earth), him too differentiated (metal nucleus, coat) which under a particular angle of impact and a relative speed came to collide the Earth. This collision provokes the fusion of both metal nuclei, whereas the materials of the coat of both objects of the solar system are ejected but remain bound to the Earth by the force of gravity.

Most of its materials are slowly going to gather together in what is going to become our Moon. All this takes place at the very beginning of the history of the Earth, which kept it no track. Nevertheless, the numeric simulations succeed in representing well enough the stages. On the other hand, this hypothesis is contradictory not at all with that we know at present about the Moon.

The Moon has a sure influence on the life of the Earth, this gravitational influence is due to its nearness. The tide for example is produced by the movement of revolution of the Moon around the Earth. This leads a differential gravitational effect with regard to the gravitational effect the Moon-Earth on the oceans and the seas, provoking locally an increase of the level of waters on the surface of the Earth in the direction Earth-moon, and in both senses (towards the Moon and inverse). On Earth the wave of tide is late with regard to the movement of the Moon because of its friction on sea bed what

provokes a slow slowing down of the movement of rotation of the Earth, and a progressive estrangement of the Moon. The seismic activity, the magma of the coat, present under the solid earth's crust, undergoes too because of its sticky state of the movements, corresponding to the passage of the satellite. For certain scientists, the fragmentation of the earth's crust in patches would be a consequence of the presence of the Moon when this one was much more near the Earth for its origin. The nautili for example, possesses a shell in spiral formed by rings and every day, a supplementary ring builds up itself.

Every month a new internal partition forms. This is bound to its instinct of spawn, which makes it go back up near the surface to every full moon. By observing fossil shells of the nautili we confirm indirectly the progressive increase of the distance Earth-moon.
The axis of the Earth varies between 21 and 24° approximately with regard to the heavenly equator. That of the Mars which has no comparable natural satellite varies between 20 and 60°. The scientists think that the Moon stabilizes the Earth in its movement as a counterweight of the system Earth - moon.