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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


Satellites of Mars

      

         

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

        

Moons of Mars

       category : satellites of planets
       

Both moons of the planet are Phobos and Deimos (names pulled by the sons of the god Ares in antique Greece). They orbit near the planet, in some thousand kilometers of this one. They are bound in Mars by the strengths of tides, always showing the same face in its direction.

 

As Phobos orbits around Mars more quickly than turns the planet itself, the strengths of tides make decrease its orbital beam in a slow, but constant way, at the rate of 9 cm a year. In 20 in 40 million years, Phobos will crash on the Martian surface. Deimos, on the other

 

hand, is taken away enough so that its orbit tends rather to go away, it in a infinitely slow way. It is an allusion to a Greek verse, " The God of the war arrives, flanked by its two satellites (hired men) fear and terror " phobos mean in Greek 'fear', and Deimos 'terror'.
         

Phobos

      

category : satellites of planets
       

Deimos and Phobos is constituted by rocks rich in carbon and by ice (as the asteroids of type - C). Both are strewed with craters of impact as all the telluric objects of the solar system. The orbit of Phobos is below the beam orbital synchronous. It gets up on the West, moves very quickly through the sky and goes to bed in the East, usually twice a day. It is if near Mars where he cannot be observed over the horizon completely by the surface. Phobos is condemned because its orbit being below the synchronous height, the strengths of tides decrease gradually its orbital beam at the 1,8 meter rate by century. In approximately 40 million years, it will break to form a ring around Mars or it will crash on its surface.

  

 
Phobos   Lune de Mars
diameter   26,8×21×18,4 km
mass   1,070x1016 kg
discovered in   august 20th 1877
discovered by   Asaph Hall
distance of Mars   9 380 km
         

Deimos

      

category : satellites of planets
       

Deimos would be originally a primitive meteorite, because quite as Phobos, her composition differs from that of the Mars. This moon would have formed in the external belt of asteroids between Mars and Jupiter, because its color and its density are close to asteroids of type C, common in this belt of asteroids. It is a small rotating, very dark irregular body of shape there 30H18mn on its orbit in 23 460 km. It is in synchronous rotation, presenting, quite as Phobos or the Moon, always the same in front of the planet. Too close to Mars, he cannot any more be visible beyond the 82nd parallel. Deimos seems smooth with its ground swamped with dust of regolith, no crater exceeds 3000 m of diameter. The surface seems exempt of streak. Considering his weak gravity 4.10-4g, due to his small size, a man would take off by jumping in 36 kph, what amounts to an escape speed of 10m/s.

  

 
Deimos   Lune de Mars
diameter   15×12×10,4 km
mass   0,224x1016 kg
discovered in   august 17th 1877
discovered by   Asaph Hall
distance of Mars   23 460 km
         

Related subjects

      

category : satellites of planets
       

Satellites of Jupiter

        

Satellites of Saturn

        

Satellites of Mars

        

Satellites of Neptune

        

Satellites of Uranus

        
         

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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