1ES 492 (H): Planetary GeologyLecture 13: Uranus and NeptuneUNIVERSITY OF SOUTH ALABAMAhttp://www.crystalinks.com/uranusrome.htmlOrigin of sedimentLast time…Saturn1. Historical information2. Photos3. Interesting moons4. TitanSaturnHistorical Information•Known by the ancients (Assyrians; 700 BC)• Named after the Roman god of agriculture• Father of Jupiter•Studied in by Galileo in 1610 who claimed that Saturn had 2 “ears”•Huygens in 1655 identified a ring around Saturn•Cassini in 1676 identified the first gap in the rings •First visit by spacecraft: 1979 (Pioneer 11; flyby)•4 missions to date (Voyager 1/2; 1980, 1981) Cassini(2004-present)•Huygens(soft sanding on Titan)http://psarc.geosc.psu.edu/TITAN/HuygensLand_usmCrop.jpgSaturn•Saturn, like Jupiter consists primarily of hydrogen and helium, but may also have water ice near its core.http://www.solarviews.com/raw/sat/satint.jpgLiquid H2Metallic H2Icy?Rocky/metallicSaturnSaturn: The coolest planet in the galaxy?•1 km thick•Composed of ice, silicate minerals and Fe-oxides•9 different ring sections (A to G)•6 gaps•May be “young”http://www.adlerplanetarium.org/cyberspace/planets/saturn/images/saturn_unlit_rings.jpgThe RingsSaturn’s SatellitesNotto scale
has intentionally blurred sections.
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2EnceladusFact Sheet: •Varied terrains; “softened”craters and fractures•Ridges look like fractured ice, some are strewn with boulders•Appears to have “icy fountain”eruptions (“cryovolcanoes”)http://www.solarviews.com/cap/pia/PIA08386.htmIapetusFact Sheet: •Long known to have 2 faces•Trailing side is brighthttp://antwrp.gsfc.nasa.gov/apod/image/0710/iapetus2_cassini_big.jpgTitanFact Sheet: •Second largest moon in solar system•Second densest atmosphere of the rocky worldshttp://antwrp.gsfc.nasa.gov/apod/ap060215.htmlTitan•The ESA Huygens landerpenetrated Titan’s atmosphere and soft landed on the moon in January 2005.•As it was descending, it recorded video and snapped pictureshttp://antwrp.gsfc.nasa.gov/apod“river” systems?Titan•Near the poles…This image is a false color radar image. Blue are low-reflection surfaces and it looks like they might be “wet”http://antwrp.gsfc.nasa.gov/apodUranus1. Historical information2. Planetary facts3. Interesting moons