Rocky planets, including Earth, is a true giant gas planets like Jupiter that fail to form. It is based on the latest theories of planet formation revealed by Sergei Nayakshin, an astronomer at the University of Leicester, as reported by Space.com, Friday (16/9/2011) ago.
Theories of planet formation is generally believed today is the core accretion. At first, there is a giant disc of gas around newly born stars. Dust particles on the disk that coalesce to form larger objects called planetesimals which then form larger structures.
As a result of that process, the mass that formed was greater. At a certain mass, called critical mass, gravity will pull the mass of gas contained in the disk around the lump. Thus, rocky planets then formed from a long and complicated process it.
Nayakshin proposed a new theory called tidal downsizing. Based on this theory, initially formed clumps of gas in zones far from where the planets are generally found so far. In the process, clumps of gas cools and shrinks to a still relatively massive planets, about 10 times the size of Jupiter.
During the shrinkage takes place, the dust particles contained in disks of gas coalesce into larger and then "fall" into the center of the blob of gas, solids forming a solid in there. This is where rocky planets eventually formed primitive with a blob of gas in the outer wrapper.
The next event, bring the disc of gas this primitive planet near the star. Gas wrapping primitive planet is then "eaten" by the parent star. The part that "saved" only the core are solid and some gas, were saved because its density is relatively large.
Expropriation process gas is then formed wrapper Super Earth planet or rocky planet like Earth. In other words, Super Earth and planetary rocks is basically a gas planet that has no chance to grow up because the mechanism in the universe and the "crime" of the star.
Nayakshin outlining a new theory of planet formation in the Monthly Notice Royal Astronomical Society's journal which was published last August. He admitted, as a new theory, there are still many shortcomings that must be covered and yet to be tested. He hopes the scientists deign examine further describing the theory.
Responding Nayakhsin theory, Aaron Boley of the University of Florida who did research on the formation of gas giant planets say that the process of tidal disruption allow life to evolve on a star system that is more varied. "This is another way nature creates the planet," said Boley. The more planets, the greater the potential for life.
Nayakhsin himself said, the core accretion model and the tidal disruption has physical measures are the same but different proportions. "In this case, the final model may be combined," he said. He also menbambahkan that rocky planets that formed in the process of tidal disruption may be measuring a "zero to 10 Earth masses."
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