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I guess that means Jupiter is a quintuple planet system then, since Jupiter and it's four largest moons would be classified as planets by that reasoning. @AV1611VET does that sound good to you?
I guess that means Jupiter is a quintuple planet system then, since Jupiter and it's four largest moons would be classified as planets by that reasoning. @AV1611VET does that sound good to you?
I was only swapping out the new rule. The previous rules would still apply. So no moons.
(Not that I personally have anything against calling the larger moons planets, mind you. I mean, Ganymede and Titan are bigger than Mercury!)
I always preferred Goofy over Pluto in Disney cartoons...In another thread, someone made this comment:
If this is your sentiment as well, were you wrong about Pluto being our ninth planet?
I was only swapping out the new rule. The previous rules would still apply. So no moons.
(Not that I personally have anything against calling the larger moons planets, mind you. I mean, Ganymede and Titan are bigger than Mercury!)
How do you define "moon"?
As "something that orbits another object"?
A natural satellite. No reason something can't be a moon and a planet at the same time, if we allow certain natural satellites to be planets. The terms don't have to be mutually exclusive.
Why are you asking me to define everything? Have I made an astronomical faux pas somewhere along the line?
I'm just saying that since Jupiter and the sun orbit their barycenter, one could argue that the sun is a moon of Jupiter.
I personally wouldn't, but there could be the argument put forth, and it would not be entirely without merit.
I always preferred Goofy over Pluto in Disney cartoons...
Um... I can't really see how one could make that argument. Technically, both objects orbit the barycenter. But we consider the object of lesser mass to be the moon of the object with the greater mass.
Yes, you can say that if one object has more mass than the other, then the more massive object is considered the planet and the least massive object is the moon, but where do you draw the boundary? If A has a mass of 1 Earth Mass and B has a mass of 1.001 Earth masses, we'd still just say it's a double planet system, wouldn't we?
And what about binary stars? Very often there is a fairly significant difference in mass there. Can a star also be a moon?
Yeah, the slightly less massive one would be the moon of the slightly more massive one.
Y'know, I don't see why not. But good luck finding somebody who calls Alpha Centauri B a moon.
I thought one of two mutually orbiting bodies is considered to be a satellite of the other when the barycentre is within the circumference of the other. But I may have misunderstood - it doesn't work for Jupiter and the sun...If we say that two objects, A and B, orbit the center of mass which is between them, any reasoning that says that B orbits A can be used to reason that A also orbits B.
Yes, you can say that if one object has more mass than the other, then the more massive object is considered the planet and the least massive object is the moon, but where do you draw the boundary? If A has a mass of 1 Earth Mass and B has a mass of 1.001 Earth masses, we'd still just say it's a double planet system, wouldn't we?
And what about binary stars? Very often there is a fairly significant difference in mass there. Can a star also be a moon?
I thought one of two mutually orbiting bodies is considered to be a satellite of the other when the barycentre is within the circumference of the other. But I may have misunderstood - it doesn't work for Jupiter and the sun...
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