492-pp13 - UNIVERSITY OF SOUTH ALABAMA Last time Origin of...

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1 ES 492 (H): Planetary Geology Lecture 13: Uranus and Neptune UNIVERSITY OF SOUTH ALABAMA http://www.crystalinks.com/uranusrome.html Origin of sediment Last time… Saturn 1. Historical information 2. Photos 3. Interesting moons 4. Titan Saturn Historical 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.jpg Saturn •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.jpg Liquid H 2 Metallic H 2 Icy? Rocky/metallic Saturn Saturn: 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.jpg The Rings Saturn’s Satellites Not to scale
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2 Enceladus Fact 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.htm Iapetus Fact Sheet: •Long known to have 2 faces •Trailing side is bright http://antwrp.gsfc.nasa.gov/apod/image/0710/iapetus2_cassini_big.jpg Titan Fact Sheet: •Second largest moon in solar system •Second densest atmosphere of the rocky worlds http://antwrp.gsfc.nasa.gov/apod/ap060215.html Titan •The ESA Huygens lander penetrated Titan’s atmosphere and soft landed on the moon in January 2005. •As it was descending, it recorded video and snapped pictures http://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/apod Uranus 1. Historical information 2. Planetary facts 3. Interesting moons
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