A planet expelled from the Solar System

New research suggest that one fifth giant planet, the other four are Uranus, Saturn, Jupiter and Neptune, was disqualified from our system about 4,000 million years. That mysterious world today could be thousands of light years away and, which is just as surprising, it is possible to have moons that, if they meet the appropriate conditions are still warm enough to support life. A summary of the study can be found at arXiv.org.

The Earth: A water planet?

The Earth is the planet of our solar system where almost 70% of it is covered by water that makes up the oceans. This is due to the combination of the profusion of the chemical in the solar system, hydrogen, which is the most abundant element in the universe and oxygen, one of the most common in nuclear reactions that occur within the stars. To this is added that the atmosphere created in the surface conditions temperature and pressure close to the triple point of water,

Mercury

The second smallest planet Mercury in the Solar system following Pluto (no more Pluto creature a planet, Mercury become smaller) and also the least thick of the four rocky worlds close to the Sun are grouped in the classification of the planets land called by its composition. It follows through respect by Mariner 10, NASA; the center of Mercury was melted by the lava that flowed to the surface, in addition, Mariner found a weak magnetic field. To the knowledge acquired, it is believed that the magnetic fields remain even if the interior part is melted.

Every planet must orbit around a star

In recent times the wandering planets, which is the name often these unique worlds without star have gone from a rarity bordering on the impossible to be an unexpectedly abundant class of planets.

 Fresh investigate now provide an new revelation: Not only are there no star planets, bound only to its galaxy, but even without galaxy may have planets. These amazing worlds, formed within a galaxy may leave due to move at a colossal speed, and could make the trip alone or with their star.

Mercury appears to be less mountainous than the Moon and Mars

According to an article published in the journal Science, Mercury appears to be less mountainous than the Moon and Mars and the bowels of the planet from the Sun, with deep reserves of iron sulfide, are very different from the others in our system. The publication includes two studies from the information sent by the spacecraft "Messenger" a year ago became the first artificial satellite of Mercury and has been making observations of the topography and gravitational field in the northern hemisphere .