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 ht p:/ 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) ht p:/ 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. ht p:/ 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” ht p:/ 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”) ht p:/ www.solarviews.com/cap/pia/PIA08386.htm Iapetus Fact Sheet: •Long known to have 2 faces •Trailing side is bright ht p:/ antwrp.gsfc.nasa.gov/apod/image/0710/iapetus2_cas ini_big.jpg Titan Fact Sheet: •Second largest moon in solar system •Second densest atmosphere of the rocky worlds ht p:/ 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 ht p:/ 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” htp:/antwrp.gsfc.nasa.gov/apod Uranus 1. Historical information 2. Planetary facts 3. Interesting moons
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3 Uranus Historical Information •Discovered by William Herschel in 1781 (but was previous recorded on star charts as early as 1620) ht p:/ www.strw.leidenuniv.nl/~dave/ISM/lecture1/herschel2.gif Uranus Historical Information •Discovered by William Herschel in 1781 (but was previous recorded on star charts as early as 1620) • Herschel named it George’s Star after George III. Later it was renamed Uranus after the Greek god of the sky (Father of Saturn). ht p:/ www.astroleague.org/al/obsclubs/herschel/hers20.gif
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This note was uploaded on 02/05/2012 for the course ES 492 taught by Professor Staff during the Summer '11 term at S. Alabama.

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

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