492-pp6 - 1 ES 492(H Planetary Geology Lecture 6 Venus UNIVERSITY OF SOUTH ALABAMA Origin of sediment Last time… 1 Introduction to Mercury 2

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Unformatted text preview: 1 ES 492 (H): Planetary Geology Lecture 6: Venus UNIVERSITY OF SOUTH ALABAMA Origin of sediment Last time… 1. Introduction to Mercury 2. Tectonics on the Earth 3. Geology of Mercury Mercury Historical Information •Known for at least 5000 years (Sumerians) •Greeks called it Apollo (sunrise) and Hermes (sunset) •First visit by a spacecraft was in 1974/75 ( Mariner 10 ; 3 flybys) •Most recent visit was in 2008 (now!) by Messenger (launched May, 2004) •First orbital survey will be in 2009/10 ( Messenger ) Mercury versus Earth Drawn to relative scale Mercury The core is substantially larger than in any other planet. And the mantle is much thinner than it is on the Earth. ht p:/ www.eso.org/public/outreach/eduof /vt-2004/mt-2003/mt-mercury-interior-normal.jpg ht p:/ www.daviddarling.info/images/Mercury_interior.jpg Core=32 wt% Core=70+ wt% Mercury Crater density is lower on Mercury, Mares are generally absent, and there is one kick-ass huge crater (Caloris Basin) that dominates part of the planet ht p:/ astro.wsu.edu/worthey/astro/html/lec-mercvenus.html 2 Mercury Long semi-parallel ridges were observed during the Mariner 10 flybys suggesting late (post crater) processes. Today’s Agenda 1. Introduction to Venus 2. Imaging Venus (radar) 3. Geology of Venus Venus Historical Information •Known by the ancients (Sumerians?) . Venus Historical Information •Known by the ancients (Sumerians?) . •Like Mercury, had 2 names; Eosphorus (sunrise) and Hesperus (sunset) ht p:/ icehome.in.cnr.it/icefal s/Astro/Atmosphere/moon%20venus%20set ing%20final.jpg Venus Historical Information •Known by the ancients (Sumerians?) . •Like Mercury, had 2 names; Eosphorus (sunrise) and Hesperus (sunset) •The Roman name (Venus) was adopted over the Greek name (Aphrodite) Venus Historical Information •Known by the ancients (Sumerians?) . •Like Mercury, had 2 names; Eosphorus (sunrise) and Hesperus (sunset) •The Roman name (Venus) was adopted over the Greek name (Aphrodite) •First visit by a spacecraft was in 1962 ( Mariner 2 ; flyby, thermal imagery… Venus was hot and cloud covered, mostly CO 2 , no water… very disappointing news at the time) 3...
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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-pp6 - 1 ES 492(H Planetary Geology Lecture 6 Venus UNIVERSITY OF SOUTH ALABAMA Origin of sediment Last time… 1 Introduction to Mercury 2

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