How is Jupiter and Saturn stable why don't the gases drift off into space? Is it gravity holding it together?

A nebula is a giant cloud of dust and gas in space but it is floating around. How did Saturn and Jupiter end up as a ball of gas.

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  • Mark
    Lv 7
    1 month ago

    Gravity and temperature.  Scientists have not figured out how Jupiter-sized planets can be so close to a star as to have 4 day orbits, but in our solar system at least, all of the gas giants are far enough away from the sun that they consist mainly of gases that would boil away on Earth or Mars.

  • 1 month ago

    You got it. The planets gravity is holding it together. Smaller planets, like earth, can't hold hydrogen and helium in the atmosphere. 

  • Anonymous
    1 month ago

    you forgot about gasses in Uranus

  • 1 month ago

    Compared to a nebula, Jupiter and Saturn both have immense gravity - at Jupiter's surface, it's 2 1/2 times that of Earth, while Saturn's is much less - just about 15% greater than ours - certainly strong enough to retain their gaseous mass.  Coupled with that, both have very strong magnetic fields, keeping solar wind from blowing their atmospheres away. 

    And, nebulae can also contract, forming whole solar systems - but, it's thought that a push - a shockwave from a supernova, or perhaps gravity from a close encounter with a star - can begin the nebula to contract to begin this process. 

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  • 1 month ago

    Nebulae are incredibly tenuous, being slightly denser regions of the interstellar medium.  Jupiter and Saturn are extremely dense in comparison and are held together by their own mass.

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