Page 1 of 1

jupiters moons

Posted: Wed Nov 21, 2018 6:56 pm
by Lydia
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?

Re: jupiters moons

Posted: Thu Nov 22, 2018 8:24 pm
by David Frydman
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

Re: jupiters moons

Posted: Fri Nov 23, 2018 10:18 am
by LeoLion
There is a fairly comprehensive explanation here https://en.wikipedia.org/wiki/Moons_of_ ... _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

Re: jupiters moons

Posted: Fri Nov 23, 2018 12:51 pm
by brian livesey
Some of the smaller moons are captured asteroids and comet nuclei.

Re: jupiters moons

Posted: Fri Nov 23, 2018 3:43 pm
by skyhawk
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

Re: jupiters moons

Posted: Fri Nov 23, 2018 3:44 pm
by skyhawk
brian livesey wrote:Some of the smaller moons are captured asteroids and comet nuclei.

Perhaps ;)

Re: jupiters moons

Posted: Fri Nov 23, 2018 4:30 pm
by brian livesey
We can only wonder how long the planets will retain their present resonance.