ASTR 151 1st Edition Lecture 25 Outline of Last Lecture I Review II Chapter 11 5 III Chapter 11 6 Outline of Current Lecture IV Chapter Sections Review V Chapter 12 Saturn VI Chapter 12 Section 1 Physical Properties VII Chapter 12 Section 2 Saturn s Atmosphere VIII Chapter 12 Section 3 Saturn s Magnetosphere Interior IX Chapter 12 Section 4 Ring System Current Lecture I Chapter Sections Review a Jupiter s composition resembles the Sun II Chapter 12 Saturn a Cronus Greek Myth i Son of Jupiter b Shani Hindu Santa c Saturnus God of agriculture wealth and time Roman God i Origin behind Saturday d Can be seen with the naked eye i 1610 Galileo saw the planet but not it s rings ii 1655 Christian Huygens proposed the ring s existence iii 1675 Cassini saw gaps in the rings III Chapter 12 Section 1 Physical Properties These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute a Mass 5 7 10 26 b Radius 60 000 kilometer c Density 700 kg m 3 d Rotation Rapid and differential enough to flatten Saturn e Surface Gravity 1 065g f Has Magnetic fields g Has 62 Moons h Has atmosphere i Eccentricity of orbit is 056 j 1 0rbital rotation 29 5 earth years k Rotation period 10 57hours l Flattening 097 m Rings i There view changes in relation to Saturn s position to the Sun ii Mostly made of Water Ice IV Chapter 12 Section 2 Saturn s Atmosphere V Chapter 12 Section 3 Saturn s Magnetosphere Interior VI Chapter 12 Section 4 Ring System a D C B Cassini Division A and F ring i Similar to 81 2 21 Earth in it s apparent size b Structure i Range from millimeters to tenths of a meter ii Roche Limit 1 Best distance that the moon could survive 2 Ring system is within the limit 3 Things outside would be torn apart due to tidal force c Voyager probes showed Saturn s rings to fan out farther i F G and E rings are fairly faint ii Also found spikes F ring has braids and kinks d Moons i Known as shepherd Moons e Origin i Too active to have lasted since solar system birth ii Some portions are older than others iii They re either replenished or are continuing to form over time
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