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Ch22_Lecture - Today's Epitome Roll Lab 1 8 Returned Turn...

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05/12/09 GEOL1401/tob 1 Today’s Epitome Roll Lab 1 & 8 Returned Turn in Labs 9 & 10 Questions on the labs? Lecture on Ch 22 – “Touring our Solar System” Describe the general characteristics of the two groups of planets in the solar system. Describe the major features of the lunar surface and discuss the Moon's history. List the distinguishing features of each planet in the solar system. List and describe the minor members of the solar system Next Time Lab 11 & 12 and paper due 7/29 Final Exam on 7/29 -7/30
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05/12/09 GEOL1401/tob 2 GEOL 1401 – Chapter 22 Touring our Solar System Dr. Thomas O. Bush Roberts 116 [email protected] 214-333-5318
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05/12/09 GEOL1401/tob 3 The solar system
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05/12/09 GEOL1401/tob 4 Solar system includes Sun and Nine planets and their satellites Two groups of planets Terrestrial – rock like Jovian – gas like Planet's orbit lies in an orbital plane Similar to a flat sheet of paper Orbital planes are inclined Planes of seven planets lie within 3 degrees of the Sun's equator Mercury's is inclined 7 degrees Pluto's is inclined 17 degrees Asteroids Comets Meteoroids Kuiper belt Oort Cloud
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05/12/09 GEOL1401/tob 5 Two groups of planets Terrestrial (Earth-like) planets Mercury through Mars Small, dense, rocky Low escape velocities Jovian (Jupiter-like) planets Jupiter through Neptune Large, low density, gaseous Massive Thick atmospheres composed of hydrogen, helium, methane, and ammonia High escape velocities Pluto not included in either group
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05/12/09 GEOL1401/tob 6 Planets are composed of Gases Hydrogen Helium Rocks Silicate minerals Metallic iron Ices Ammonia (NH 3 ) Methane (CH 4 ) Carbon dioxide (CO 2 ) Water (H 2 O)
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05/12/09 GEOL1401/tob 7 Evolution of the planets  Nebular hypothesis Solar system condensed from a gaseous nebula Planets formed about 5 billion years ago As the planets formed, the materials that compose them separated Dense metallic elements (iron and nickel) sank toward their centers Lighter elements (silicate minerals, oxygen, hydrogen) migrated toward their surfaces Process called chemical differentiation Due to surface gravities Venus and Earth retained atmospheric gases Due to frigid temperatures Jovian planets contain a high percentage of ices
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05/12/09 GEOL1401/tob 8      The Nebular hypothesis
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05/12/09 GEOL1401/tob 9 Earth's Moon  General characteristics Diameter of 3475 kilometers (2150 miles) is unusually large compared to its parent planet Density 3.3 times that of water Comparable to Earth's crustal rocks Perhaps the Moon has a small iron core Gravitational attraction is one-sixth of Earth's No atmosphere Tectonics no longer active Surface is bombarded by micrometeorites from space which gradually makes the landscape smooth
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05/12/09 GEOL1401/tob 10 Lunar surface Two types of terrain Maria (singular, mare
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