Virtually all the planets of the solar system have satellites. The exceptions are Venus and Mercury. Satellites of the planets are constantly opening. To date, they number about 170, including those belonging to dwarf planets, as well as those that "patiently" expect their official confirmation.
The sun keeps its objects by gravity. Next to this yellow star are drawn small planets of the terrestrial group, behind which is the belt of asteroids. Next are giant planets that do not have a solid surface and consist predominantly of hydrogen and helium. And completes the harmony of the second belt of asteroids.
Satellites of the planets of the solar system are diverse in shape, size, some of them even have their own atmosphere. Most of them were formed from gas and dust. Known not only the satellites of planets, but even asteroids - as a rule, they are quite tiny. The largest in the solar system is Ganymede - the "moon" of Jupiter. He is so huge that he has to have his own magnetic field. The most mysterious is Io. On this satellite there is a constant volcanic activity with eruptions. However, the surface of the Io always remains smooth - the lava fills the craters and aligns the firmament, as if glancing it. Jupiter is a unique planet. Together with his numerous companions, he forms a system similar to the solar one.
Not less a lot of "moons" are owned by other giant planets - Uranus and Neptune. Saturn has more than 50 satellites registered. One of them - Titan - is second only to the leader Ganymede and has its own atmosphere consisting of nitrogen. They say that if it is worth looking for life in the solar system - so only on it. On this satellite there are often methane rains, and on its surface, perhaps, are the most real seas, however, also from methane. However, Titan keeps all his secrets behind opaque clouds. Notable and Triton - a satellite of Neptune. He also has an atmosphere. On it were found craters, polar caps and even the most real gas geysers. In the solar system, Triton is the only satellite whose direction of rotation is opposite to the rotation of its planet. Miranda can not be called a beauty. This satellite of Uranus is made of various pieces, but differs in a variety of mountain landscapes.
The satellites of the terrestrial planets are no less curious and original, although they are presented in a much smaller quantity. The earth is the only body inhabited by living organisms in the solar system, has a moon as a satellite. Its diameter is one quarter of the earth. The moon is the largest satellite in relation to the size of its planet. There are no others besides the artificial ones. "Red Planet" Mars is accompanied by two natural moons of small size and irregular shape - Phobos and Deimos. They are always one side to their planet. By the way, there is a legend that life on Mars still existed, but reliable evidence is not yet found or published. Satellites of the planets are absent from two planets of this group - Venus and Mercury. They are too close to the Sun, most likely, their "moons" burned out.
How it looks like this or that planet from the satellite, you can find out by using a special service. In most cases, however, this will only be a simulated image. After all, until now a man managed to visit only one moon, the moon.