Astronomy - Astronoo


\|	\| planets 8 planets of the solar system (Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune) and their satellites.	\| sun The Sun is in 2/3 of the galactic center towards the edge, at a distance of 30 000 light years of the center. The Sun moves in a speed of 230 km/s around this galactic center during its revolution which it makes in 250 million years.	\| galaxies The Galaxy, it is the name datum in our galaxy, it is an enormous spiral wheel of stars, a diameter of 100 000 light years. What appears of the Earth, it is a white continuous band called the Milky Way.	\| bigbang There is 15 billion years a tremendous explosion of light gives birth to the space, in time, in the matter, a chaos burning with an inconceivable heat, a formless porridge which is going to swell, to extend in all the directions and to cool quite slowly.	\| quotations Some quotations of big men (Aristote, Galilee, Newton, Platon, Laplace, Einstein).	\| links Some external links concerning the astronomy.	\|
\|	\| dwarf planets According to the definition which was approved on August 24th, 2006, during the 26th General assembly of the UAI ( International Astronomical Union), three bodies reach the status of dwarfish planet: Pluto, eris, and Ceres. Others objets should soon join this nomenclature.	\| solar system The solar system is really much more complex if we take into account all the objects being a part of the system. A considerable number of objects is in the belt of Kuiper and still beyond in the cloud of Oort.	\| galaxy groups Heap of galaxies are the biggest structures of the Universe. They are constituted by hundreds of galaxies connected together by their own gravitational attraction. Between the galaxies we find some material constituted by warm gas there, forming a plasma, the temperature of which reaches 10 to 100 million degrees.	\| comets Besides planets, satellites and asteroids, the solar system contains comets (hair in Greek). The roaming comets originate in the depths of the space in several lights years. The number of periodic comets is of the order of 2000.	\| biographies Some biographies, Einstein, Baade, Lyot, Hale, Hubble, Shapley, Laplace, Maxwell, Newton, Herschel, Kepler, Galilee, Aristotle...	\| glossary Definition of certain words or expressions used on this site in link with the astronomy.	\|
\| articles Christian's articles in link with the astronomy (history of the Earth, the electron, the neutrons stars, the rings of Saturn, the particles, the threat of asteroids, journey in the universe up to the atom)...	\| exoplanets Exoplanets are situated by definition outside our solar system. Seen the large number of existing galaxies and the large number of stars which they contain, the search for these exo-planets or extra solar planets, is unlimited.	\| constellations A constellation is a group of stars of the sky which enough close relations looked the appearance imagination of a figure onto the sky.	\| nebulas Of the Latin 'nebula' which wants to say cloud, clouds of gas and dusts in the middle of stars, nebulas are at the same moment active crèches and cemeteries of stars. These magnificence of the sky are lit by the stars which they contain or by stars situated behind them.	\| telescopes A telescope is constituted by a mirror which concentrates the light resulting from the observed celestial body and from the objective which supplies an enlarged image with it. The increase and the luminosity are proportional on the surface of the mirror. The presence of the ground atmosphere limits the performances of a telescope. It is to mitigate this inconvenience that spatial telescopes were placed in the space.	\| bibliographies Some interesting books in link with the astronomy.	\| faq Some simple answers concerning the universe which surrounds us.	\|
\| asteroids Numerous small rocky called bodies asteroids are present in the solar system, an important part of them circulate in a ring, between the orbit of Mars and that of Jupiter in 2 to 4 UA.	\| rings The rings of Saturn are one of more beautiful and of the most surprising spectacles of the solar system. That is why on July 1st, 2004, the spaceship Cassini-Huygens reduced its speed to be captured by the gravity of Saturn to enter in orbit with this one.	\| stars A star is a celestial body similar to the Sun, which shines thanks to nuclear reactions which occur in its center.	\| multiverse The universe is an expanding cosmic bubble. This bubble creates a new bubble which produces it the others etc.... Quantities of the other universes which give birth to the other universes, it is an interesting idea but which remain at the moment very speculative.	\| space probes These instruments that are space probes, perceive in the detail the forms and the composition of objects of the distant regions and offer us exceptional sights of an unequalled precision.	\| elements The most usual and practical presentation of the diverse chemical elements is the periodic board of elements also called Table of Mendeleyev. The atoms which have the same number of protons but a number different from neutrons are called isotopes.	\| aurora A polar aurora called aurora borealis in the north hemisphere and the aurora australis in the southern hemisphere, is a brilliant phenomenon characterized by sorts of veils extremely colored in the night-sky.	\|

The universe is all worked up

Astronomy: " without the astronomy the man ignores the place which he occupies " Aristotle. Greek born in Stagire in 384 avenue Philosopher. BC and died to Chalcis in 322 avenue. BC Son of a doctor attached to the person of king of Macedonia, he was the pupil of Plato. This astronomy site proposes travelling in the infinite space which we surround. The human mind requires having a unified and coherent representation of the world, but it is very difficult to explain the world visible by invisible strengths. Nevertheless, we don’t belong neither to the predictable world of the Science, nor to the arbitrary world of the Gods, but to the world of the Life, the

word of the duration, and of the uncertain times. We are in a world of unforeseen events, tests and errors, which we try to take advantage of them. There is 15 billion years a tremendous explosion of light give birth to the space, to the time and to the matter. This gigantic chaos, with an inconceivable heat, propels a misshapen “soup” which is going to swell, which is going to spread in all the directions, and to get colder slowly. Today we still capture the radiation trace of the

essential fire, in the sky. The infinitesimally small generated the infinitely big: the Universe The universe is the central subject of study of the cosmology. Among the numerous scientific theories which try to explain the origin of the Universe, the theory of Big Bang is considered as the official theory by the majority of the scientists. It is possible that there are several universes [see the menu 'multiverse']. , this indecision and changes environment. This desperate cry we hear all around the word « let us save the planet », is nothing else that the fear of the humanity disappearance, because, the planet is not concerned about the presence of this stowaway. The humanity has to spread in the space to survive.

last articles

Volcanoes...We count approximately 1 500 active ground volcanoes of which about sixty enter eruption every year. The word "volcano" comes from Vulcano, one of Aeolian Islands named in honor of Red admiral, the Roman god of the fire. [See Christian Simoes's article]
Concept of entropy... Entropy, uncertainty, disorder, complexity, thus appear as adversities of the same concept. Under the one or other one of these forms, the entropy is associated with the notion of probability. it characterizes not an object in itself, but the knowledge which we have of it and our possibilities of making forecasts. it thus has a character at the same moment objective and subjective. [See Christian Simoes's article].
The rings of Saturn... and particles of ice of a size varying of the speck of dust in some meters. [See Christian Simoes's article].
Black matter...In astrophysics, the black matter (or matters sinks) indicates the apparently undetectable matter. Various hypotheses were emitted and investigated on the composition of this hypothetical black matter. [See Christian Simoes's article].
Vision egocentric...And if the Universe was only one blazing illusion? A black labyrinth splashed with images ghosts, papered with strange virtual mirrors... If by the magic of the structure of the cosmos celestial bodies by billions which we perceive in the top were as well no as the reflections repeated by some stars only [See Christian Simoes's article]
Are we alone ?Let us take into account the chances which we have to discover a life somewhere else. [See Christian Simoes's article]
Asteroid, the threat...An asteroid 16 km in diameter would provoke a 200 km crater, it once arrives every 100 million years [See Christian Simoes's article].

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