System solar |
|
|||
| automatic translator | ||||
|
The solar systems |
category : solar system | |||
|
Our planetary system possesses only a single star, the
Sun. However thanks to the spatial telescope Spitzer, the astronomers
observed that the multiple planetary systems, with two, three stars or
more, are numerous. Such systems tend to form a central pair, the other
constituents playing troublemaker's role with regard to the orbital
movement of the group. More of half of the systems with stars are
exactly binary, it is completely likely that the universe is constituted
by planets revolving around two stars. |
On 200 planets discovered except our Solar system, approximately
50 revolve around one of the stars of a very vast binary system. |
|
||
| Our solar system and its planets |
category : solar system |
|||
|
Our solar system is constituted by the Sun, by eight
planets, by three dwarfish planets, as well as the small bodies as
asteroids and comets, with their satellites. In the center is situated
the Sun, our star which contains 99,86 % of the mass of all the system.
The inside of the Sun has a density and a temperature such as
thermonuclear reactions occur, loosening enormous quantities of energy.
The biggest part of this energy is freed in the space in the form of
electromagnetic radiations, mainly in the form of visible light. The Sun
also emits a stream of charged particles called the solar wind. This
solar wind interacts strongly with the magnetosphere of planets and contribute to eject gases and dusts except the solar
system. |
Beyond, still opens the domain of the huge, gaseous and
little dense planets, with a nucleus of weak dimension: Jupiter, Saturn,
Uranus and Neptune. Beyond, Pluto, Eris and the other objects of the
belt of Kuiper. |
The solar system, which counted nine planets since 1930, contains no more than eight since August, 2006 (Pluto was added to the list of the minor objects of the solar system and saw attributing the number 134340 in the catalog of the minor objects). This belt, populated with thousand asteroids, is the reservoir of comets in short period. |
||
|
||||
| The solar system and its objects |
category : solar system |
|||
| |
||||
| The solar system is really
much more complex than it appears to it, if we consider all its objects.
A considerable number of objects is in the belt of Kuiper and still
beyond in the cloud of Oort. |
|
|||
| Birth of the solar system |
category : solar system |
|||
| |
||||
The event takes place there is 4,5 billion
years in the neighborhood of a spiral arm of the Galaxy. In a nebula of
opaque rotating gas, of small heap constitute.
Among them, our future Sun escapes from it.
|
|
|||
During this young period the
central temperature increases. This cloud is going to contract still
until reach temperatures of some million degrees.
|
|
|||
| Our Sun is is born |
category : solar system |
|||
Let us remind that our Sun got 99,8 % of the total mass of its system. The rest of the warm gaseous nebula of the departure, the composition of which is identical to that of the Sun, continues to lose some heat. It arrives one moment when we reach the temperature which certain chemical compounds are not stable any more in the gaseous state. These compounds are thus going to condense, not in liquids but in solids, because the pressure is very weak. The nebula thus takes care of solid grains, dusts which we thus call condensats Solid grains of condensed chemical and mineralogical compounds be born in nebulas, following that we call: the sequence of condensation. The first compounds which condense in 1300°C, are oxides rich in titanium, aluminum and calcium. Towards 1050°C condenses massively the metal iron, then towards 950°C, the first silicate in this particular case the silicate of magnesium and iron. Towards 800°C, form silicates with more cowardly structures, feldspars and iron sulphide. In even lower temperatures condenses a silicate containing some water and in 0°C the water condenses icy.. It is these grains which, by accumulating under the influence of the gravitation, are going to give birth to more and more big solid objects; at first, in meteorites, then later, in planets.
|
|
|||
| Life cycle of the Sun |
category : solar system |
|||
| |
||||
| In 5 billion years our Sun will have transformed all its hydrogen into helium. A new period of contraction is going to warm the nuclei of helium which combined 3 by 3 will give some carbon and 4 by 4 of the oxygen. The outside layers are going to swell and to cool and our celestial body will become a giant red as, Arcturus, Betelgeuse, Antares and many others at present. During this time its heart continues to contract until reach the temperature which is going to light the | thermonuclear reactor with fusion of helium
to make some carbon. This phase will last hardly a million years. All
the matter of the close planets is vaporized. The successive fusion of the carbon and the oxygen will give birth to nuclei precious as the magnesium, the aluminum, the silicon which constitute our ground rocks, as the phosphor and suffers it the main part in the elaboration of the life. These phases of fusion will be more and more short, we shall arrive at the end |
of the reserves of matter. The Sun will
die and returning its matter to the distant space. It will not be more that a
white dwarf so the buckle closes. Every star contributes to enrich the
middle, of absent heavy elements at the beginning. 10 % of stars are
dwarfs. These stars at the end of life have already lived our time and
enriched the matter which allowed us to live. The death of the Sun will
sow the germs of the other forms of life... SOMEWHERE ELSE ! |
||
| Distances with regard to the Sun |
category : solar system | |||
The
solar system is the name given to the planetary system consisted of the
Sun and the heavenly objects revolving around him. By extension, the
term solar system can be sometimes employed to indicate the other
planetary systems.
|
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
Related subjects |
category: sun and stars |
|||
| |
||||
Stars |
|
|
Astronomy - october 15th 2007 |
