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 Post subject: jupiters moons
PostPosted: Wed Nov 21, 2018 6:56 pm 
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Hi, I'm new to astronomy. I'll probably be asking lots of questions! My first question is: How did Jupiter and Saturn get rock moons when they're gas giants? How did their moons form?


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 Post subject: Re: jupiters moons
PostPosted: Thu Nov 22, 2018 8:24 pm 
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Hi Lydia and welcome.

A good question.
I don't know the answer, but with a lot of material one probably ends up with a gas outer part and maybe metal? solid inner core.

With a small amount of material, more likely solid outer part.

But the Earth has I think a molten inner core.

So maybe the answer is just gravitational forces.
For larger or smaller amounts of material.

As I said, I don't really know.

Regards,
David


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 Post subject: Re: jupiters moons
PostPosted: Fri Nov 23, 2018 10:18 am 
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There is a fairly comprehensive explanation here https://en.wikipedia.org/wiki/Moons_of_Jupiter#Origin_and_evolution . Finding that and so familiar with the four Gallileons (spelling?) there are now seventy nine .Hope the wiki helps (its wised me up too).
Re the Saturnian moons look here https://en.wikipedia.org/wiki/Moons_of_Saturn#Formation


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 Post subject: Re: jupiters moons
PostPosted: Fri Nov 23, 2018 12:51 pm 
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Some of the smaller moons are captured asteroids and comet nuclei.

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 Post subject: Re: jupiters moons
PostPosted: Fri Nov 23, 2018 3:43 pm 
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https://www.space.com/48-saturn-the-sol ... bearer.htm

As the most massive planet in the solar system after Jupiter, the pull of Saturn's gravity has helped shape the fate of our system. It may have helped violently hurl Neptune and Uranus outward. It, along with Jupiter, might also have slung a barrage of debris toward the inner planets early in the system's history

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 Post subject: Re: jupiters moons
PostPosted: Fri Nov 23, 2018 3:44 pm 
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brian livesey wrote:
Some of the smaller moons are captured asteroids and comet nuclei.



Perhaps ;)

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For info, I am Autistic, Aspergers, ADHD, therefore if I come over as a little "short" on occasions it is not intended, thank you


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 Post subject: Re: jupiters moons
PostPosted: Fri Nov 23, 2018 4:30 pm 
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We can only wonder how long the planets will retain their present resonance.

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