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 |  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.

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|  |  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.

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| 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.

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| 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.

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 The universe is all worked up Imprimer cette page


Venus

      

Mercury Mercury the first planet of the solar system in 57,9 million km of the sun is, its diameter is 4880 km.  Venus Venus the second planet of the solar system in 108,2 million km of the sun is, its diameter is 13000 km.  Earth Earth the third planet of the solar system in 149,6 million km of the sun is, its diameter is 12756 km.  Mars Mars the fourth planet of the solar system in 227,9 million km of the sun is, its diameter is 6800 km.  Jupiter Jupiter the fifth planet of the solar system in 778 million km of the sun is, its diameter is 143000 km.  Saturn Saturn the sixth planet of the solar system in 1427 million km of the sun is, its diameter is 120500 km.  Uranus Uranus the seventh planet of the solar system in 2870 million km of the sun is, its diameter is 51120 km.   Neptune Neptune the eighth planet of the solar system in 4496 million km of the sun is, its diameter is 49530 km. 
Moon Earth possess that a single natural satellite, the Moon which orbits in 160000 km of the earth.   satellites of Mars Mars possess 2 known natural satellites, Phobos and Deimos. They orbit near the planet, in some thousand kilometres of this one.   satellites of Jupiter Jupiter possess more than 60 known natural satellites, among which Ganymede, Io, Callisto, Europe and the others... 
  satellites of Saturn Saturn possess 59 known natural satellites, of which Titan, Rhea, Japet, Dioné, Thetys, Enceladus, Mimas, Hyperion, Phoebe, Janus, Epimethea, Promethea, Pandore and the others...  satellites of Uranus Uranus possess at least 27 known natural satellites, among which Titania, Oberon, Umbriel, Ariel...  satellites of Neptune Neptune possess tens of known natural satellites, of which Triton, Proteus, Larissa, Galatea, Despina, Nereid, Thalassa, Naiad...
 

automatic translator

        

Venus " the evening star "

      

category : planets
       

Venus is an internal and telluric said planet, the 2nd by leaving the Sun. It is of size comparable to that of the Earth. According to the observations, Venus does not possess a magnetic field. On the other hand, it drags in its trail a long tail of plasma of 45 giga meters (million kilometers), observed for the first time by the probe SOHO in 1997. It is the third object the most glittering with the sky, after the Sun and the Moon; thus very easy to track down among stars. We can observe phases as for the Moon there.

 

 Venus, because of the strong percentage of variation of its distance with the Earth, present a strong variation of its visible size. For Venus the diameter varies between 10 " and 64 " A planet is more brilliant than a star, it shines with a constant brightness among stars. Planets sparkle less than stars. To identify planets it is necessary to get acquainted with the stars of the zodiac because they follow the ecliptic. These observations allowed Galilee to assert that the heliocentric theory of Copernic was true.

 
Venus    
rayon   6 051,8 km
surface   4,6x108 km2
volume   9,28 x 1011 km3
Masse   4,8685x1024 kg
rotation speed   6,52 km/h
temperature of surface   464 °C
mean period of rotation   ~243 days
         

         

Venus has a thick atmosphere

      

category : planets
       

Its size and its density are nearby of those of the Earth. It is covered with a very thick atmosphere the mass of which is 90 times the mass of the ground atmosphere, the atmospheric pressure is equivalent to the one who reigns in 1000 meters of bottom in our oceans. This atmosphere is so dense as it traps sunbeams and creates a greenhouse effect where from Its temperature on the ground of 470°C. The climatic conditions are thus extremely severe, in brief it is rather the hell. It is the mission to Marinade 10 which gave us the first precise image.

 

The visible part of Venus is thus above all its atmosphere. This atmosphere constituted by carbon dioxide and by nitrogen, turns much more fast than the planet it even, plentiful clouds show an active circulation. Several missions put machines on the surface of Venus, what allowed to cross its atmosphere of high density containing some water as well as corrosive gases, as the hydrochloric acid and the sulphuric acid. There is on Venus a meteorology in the acid. Nevertheless machines resisted several hours the time to analyze the thick rocks put on a dusty ground.

 

The flat surface of Venus has made uneven lower than 1000 meters. There are however mountains the height of which exceeds 2000 meters while the mountain Maxwell peaks in 11000 meters.
Venus has no magnetic field.
The day gets up on the West on Venus. The axis of the planet was certainly reversed due to the effect of tide exercised by the Sun on the dense atmosphere of Venus. Little by little the rotation of the planet slowed down until make it turn in the other sense.
         

Related subjects

      

category: planets
       

Mercury

  

Jupiter

    

Venus

  

Saturn

    

Terre

  

Uranus

    

Mars

  

Neptune

    
         

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 |  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 Imprimer cette page


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Astronomy - october 15th 2007