AST301_Lecture14.pdf - AST301 Lecture 14 Chapter 12 RINGS,...

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AST301Lecture 14Chapter 12 RINGS, MOONS, AND PLUTO
AST301Lecture 14Chapter 12RINGS, MOONS, AND PLUTOLearning Goals:At the end of this lecture you will:ØKnow more about themajor moonsof JupiterØUnderstand the concept oftidal heatingØKnow more aboutSaturn’s major moonsØKnow more aboutPlutoand theKuiper beltØUnderstand thering systemsof the giant planets
AST301Lecture 14Chapter 12 RINGS, MOONS, AND PLUTO
AST301Lecture 14Chapter 12 RINGS, MOONS, AND PLUTOThe Galilean Satellites (Jupiter):
• The colors are caused by sulfurand its compounds.• The dark spots are volcanoes.• The volcanoes are active today.Their lava is rich in sulfur andsulfur compounds.• Superhot volcanoes• Youngest surface in Solar System• MostvolcanicobjectinSolarSystem!Jupiter’s Moon IoAST301Lecture 14Chapter 12 RINGS, MOONS, AND PLUTO
Europa: second moon out from Jupiter• Europa is entirely covered by water ice.• The ice layer is several kilometers thick.Ice in Europa (up) vs. Earth (down)AST301Lecture 14Chapter 12 RINGS, MOONS, AND PLUTO
AST301Lecture 14Chapter 12 RINGS, MOONS, AND PLUTOIce surface• The layer of saltwater (not ice) isinferred from theelectrical andmagnetic propertiesof Europa.• As free-flowingwater is arequirement for life,it has beensuggested that lifemight exist onEuropa.Both, Europa’s and Io’sinteriors are gettingheated!BUT HOW?Europa has salt water ocean below its ice surface
Jupiter’s gravity raises tides in its moons• Thevarying distortioncausesfriction inside the moons.• The friction heats the moons.• Io is closest to Jupiter and has the shortest orbital period (1.8 days), so it is heated most.• Callisto is furthest from Jupiter and has the longest orbital period (16.7 days), so it isheated least.• Io is heated so much that it has continuous volcanic activity.Its surface is replaced everyfew million years.It has become even more differentiated than the Earth, and sulfur hasfloated to its surface.

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Term
Fall
Professor
Harvey
Tags
Io, Titan

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