Ch12.pdf - Dr. Morales Astronomy M01 Introductory Astronomy...

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Dr. Morales1Astronomy M01Introductory AstronomyBy Dr. Morales0Ring and Moon Systems IntroducedThe Galilean Moons of JupiterTitan and TritonPluto and CharonPlanetary RingsCh. 12: Rings, Moons & PlutoDr. Morales11
Dr. Morales2Solar System MoonsDr. Morales2Moons of the outer solarsystem are not composed ofthe same materials as themostly rocky objects in theinner solar system.Icy moons formed in regionsof lower temperature.Most of these objects alsocontain dark, organiccompounds mixed with theirice and rock.2Largest Moons, Smallest PlanetsMoons are held in place by gravity around of their parent planetsThey are @ the exact distance necessary to orbit—too close, they would be pulled into theplanet; too far, they would drift out of orbit & into spaceDr. Morales33
Dr. Morales3Jupiter’s MoonsDr. Morales44Jovian MoonsJupiter has79natural satellites (moons)The 4 largest:Io, Europa, Ganymede, & CallistoTheir orbits form a pattern known as aLaplace resonance—for every 4 orbits Io makes aroundJupiter, Europa makes exactly 2 & Ganymede makes exactly 1gravitationally distorting their orbits into elliptical shapes (each receives an extra tug from its neighbors at thesame point in every orbit)The tidal force from Jupiter, however, works to circularize itResults in regular tidal flexingàheats their interiors by frictionSeen dramatically in the extraordinary volcanic activity of innermost Io (subject to the strongesttidal forces), and to a lesser degree in the geological youth of Europa's surface (indicating recentresurfacing of the moon's exterior)5
Dr. Morales4What would life on Europa look like?

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Term
Fall
Professor
HalJandorf
Tags
Solar System, Planet, Neptune, Natural satellite, Dr Morales

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