Si ritiene che il Sole e i pianeti si siano formati da una nebulosa di gas interstellari in contrazione, circa 4,6 miliardi di anni fa.
L'ipotesi di un'origine comune trova conferma nell'analisi di alcune regolarità di comportamento dei pianeti, che ruotano attorno al Sole muovendosi tutti nello stesso verso e percorrendo orbite sostanzialmente complanari.
Secondo le attuali teorie, la nebulosa primordiale aveva una temperatura molto bassa and consisted of hydrogen, helium, from a wide variety of chemical elements heavier and dust.
About 5 billion years ago at the center of the nebula would have created a more dense and thus the cloud, under the influence of gravitational force, would begin to contract.
In a few million years, in the central density and temperature would increase and would have formed the proto-Sun. At the same time, the contraction would have caused an increase in the speed of rotation and the centrifugal force of the system. So the cloud would be compressed, taking on a look similar to a rotating disk around the Sun the gravitational collapse of the mass of the proto-sun would have caused an increase temperature in the most central.
In the final stages of the process, a strong solar wind would have carried to the outer regions all light elements, mainly hydrogen and helium.
While the core of the proto-sun was warming up to reach the temperatures required for thermonuclear reactions in the surrounding disk will increase some bodies through collisions and attracting smaller fragments present in the surrounding space. It would thus forming proto-planets, which would be derived from existing planets, while the proto-Sun was turning into a yellow star and stable.
L'ipotesi di un'origine comune trova conferma nell'analisi di alcune regolarità di comportamento dei pianeti, che ruotano attorno al Sole muovendosi tutti nello stesso verso e percorrendo orbite sostanzialmente complanari.
Secondo le attuali teorie, la nebulosa primordiale aveva una temperatura molto bassa and consisted of hydrogen, helium, from a wide variety of chemical elements heavier and dust.
About 5 billion years ago at the center of the nebula would have created a more dense and thus the cloud, under the influence of gravitational force, would begin to contract.
In a few million years, in the central density and temperature would increase and would have formed the proto-Sun. At the same time, the contraction would have caused an increase in the speed of rotation and the centrifugal force of the system. So the cloud would be compressed, taking on a look similar to a rotating disk around the Sun the gravitational collapse of the mass of the proto-sun would have caused an increase temperature in the most central.
In the final stages of the process, a strong solar wind would have carried to the outer regions all light elements, mainly hydrogen and helium.
While the core of the proto-sun was warming up to reach the temperatures required for thermonuclear reactions in the surrounding disk will increase some bodies through collisions and attracting smaller fragments present in the surrounding space. It would thus forming proto-planets, which would be derived from existing planets, while the proto-Sun was turning into a yellow star and stable.
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