Comet

Comets are unsteady body, which usually include little not many kilometers in distance. When you are at a great distance from the Sun are down, its small core, which can vary from a few hundred meters to about 10 km. only reflects light. Near the sun the core is surrounded by a "head", the comma, whose diameter can be up to 30,000 km. The coma is composed of gas emerged from the nucleus by sublimation and dust. Its production increases severely as we advance the Sun.

Uranus

From Earth the Uranus in study by a telescope. Within walking distance of the cloud tops and a pressure of 0.4 times that recorded on Earth at sea level the temperature is -214 ° C. The chemical composition of the uppermost layer of the atmosphere is mostly hydrogen gas while the bulk of Uranus is composed of heavy material. Uranus should be composed predominantly water ice, ammonia and methane compounds that because the most abundant elements (hydrogen, oxygen, carbon and nitrogen) are the usual ice in the solar system. Its south pole exposed to the sun for decades seemed stained with a reddish tinge; a series of concentric waves could be clearly seen in the images processed by the computer and handfuls high luminous clouds swept from east to west by winds of up to 500 km / hour.

The Saturn

This is the second biggest in our solar system and the only planet whose average mass does not exceed that of water so if there is a sea that surround Saturn could soar.

At Saturn from a modern telescope in 1610, Galileo draw it as a globe bounded by two smaller ones as a head with large ears (the first one who came up with the Mickey Mouse logo). Galileo thought it was moons but when two years later reviewed the planet had disappeared. Later in 1655 the Dutch astronomer Christian Huygens discovered Saturn having had a satellite orbiting Titan, announced that the planet should be surrounded by an equatorial ring.

The planet Mars

After our blue planet Earth from the Sun, The Mars is the fourth planet. It is known since historic times as the "Red Planet" because of its coloration, which stimulate much interest. His name is the god of war according to the Greco-Roman mythology.

Mars is one of the planets most fascinated us throughout history, the possibility that harbored life due to their similarities with our planet, has led to weave thousands of stories about and a great hope of finding microscopic life today, in these our days in which technology allows us to almost touch this dream with your hands.

Enlarge the probability of an asteroid crash with Earth

Scientists at the Cardiff Centre of Astrobiology, UK, have developed a mathematical model that confirms that currently is experience our solar system called the extensive hydroplane, which increase the chances of an asteroid collide with Earth. An asteroid is a rocky body that orbits the Sun Becomes meteorite when it enters Earth's atmosphere. In astronomy, is called the huge hydroplane in the middle of the region in which they are most of the stars of a flattened galaxy, as twist galaxies.

The moon

The moon is the most important desire of each amateur. The additional and superior we appreciate it, the additional we desire to identify. Its closeness make us look elder than it is, and moving quickly across the sky, where it actually runs about 12 ° per day, or about half a degree per hour (its apparent diameter).

It appears that, the unfruitful planetary shell has not changed during history known to guy because if we compare the first known maps with today, however elementary they may be does not differ in their details.

Inner symphony of the Earth

Internal Structure of the Earth. Thanks to the seismically, we know how to be the interior of our planet, the core at its center, consists especially of iron possibly solid, liquid outer core would, and then the mantle would happen a thin crust.

Fascinating structure of a typhoon seen and photographed from space by the crew of the Space Shuttle. In this extraordinary image of an event in Earth's atmosphere as comparable to that of a galaxy, Typhoon Odessa shows his eye despite being scary, fascinating. Image top right: Extraordinary photography Kliuchevskoi Volcano in Russia, obtained from space by the Shuttle.