Friday, 17 April 2015

Is the solar system unique in the cosmos?

Solar system works by very simple principles. Small rocky planets are closer to the Sun, gaseous giants are far and between is asteroid belt.

On a broader level, it makes sense. When the sun is "born" enormous energy of young star pushed the lighter elements like hydrogen and helium to the outer edge of the solar system, close yourself leaving only solid materials.

Therefore, one might expect that a similar arrangement of planets can be seen in other systems throughout the universe. However, as we have already discovered many exoplanets, it turned out that this is not the case. Moreover, the arrangement of the planets in the solar system is more the exception than the rule.

Gaseous planets that are far from its parent star are very uncommon. One way to categorize them is to measure the energy they get from their stars.

Hot planets like Mercury and Venus, warm (which may be suitable for life) such as Earth and Mars and cold like Jupiter and distant planets.

In our system, all gaseous planets are "cold", while the case for less than 20 percent of the systems in the universe.

Why is
then Jupiter so far from the Sun? To tell the truth - it's not. 

According to some theories, Jupiter is most likely originated in the distance from the Sun at which the current Mars. Because of the forces that are drawn to, approaching the sun to a distance that is now Venus.
If not for the gravitational interaction with Saturn, probably would be "hot Jupiter", but gradually began to move away from the sun.

Jupiter's journey through the inner solar system explains why we do not have hot gaseous giants in the "neighborhood", but also why we do not have "super-Earth", the planet with a solid core, but much smaller atmospheres, such as the Neptune and many other planets in other systems.