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Astronomy and Cosmology
Astronomy and Astrophysics
Saturn's 145 Moons: The Latest Discoveries and What Sets Them Apart
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[QUOTE="Vanadium 50, post: 6891481, member: 110252"] Go down that path and before you know it, Pluto will no longer be a planet. Without some sort of minimum size, counting moons is hopeless. Is every speck of dust a moon? Moons seem to fall into a few categories: 1. Big, round, and rocky: Earth's moon, Titan, and the four largest moons of Jupiter fall into this category. 2. Smaller, round and icy: Rhea is the prototype. I'd also include Triton,the large Uranian moons, and many of the larger Saturnian moon: Tethys, Dianoe. The lower limit on size is in the 100-150 km radius ballpark. I admit that "rocky" and "icy" are somewhat subjective, and certainly position dependent. 3. Irregular moons. Again, the line between "round" and "irregular" is blurry. I would draw the line between Mimas and Hyperion, but others might draw it differently. I'm not sure of distinguishing between rocky and icy makes sense, as there are only two known to be rocky: Deimos and Phobos. [/QUOTE]
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Astronomy and Cosmology
Astronomy and Astrophysics
Saturn's 145 Moons: The Latest Discoveries and What Sets Them Apart
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