WOU ES 104 - Solar System (9 pages)

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Solar System



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Solar System

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Lecture Notes


Pages:
9
School:
Western Oregon University
Course:
Es 104 - Earth System Sci
Earth System Sci Documents

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Solar System October 5 2006 I Overview of the solar system Solar system includes A Sun 1 99 85 of system mass 2 Nuclear fusion of hydrogen into helium B Objects in orbit around Sun 1 Inner terrestrial planets a Mercury Venus Earth Mars b Small stony Little atmosphere 2 Outer gas planets a Jupiter Saturn Uranus Neptune b Large Gases hydrogen and helium and ices methane ammonia 3 Dwarf planets asteroids comets meteoroids a Various compositions 1 Terrestrial material 2 ices b various locations and orbits 1 asteroid belt in planetary plane of orbit c highly eccentric and inclined orbits compared to eight planets II Composition of Solar System objects A Gases low melting temperature about absolute zero 1 hydrogen most abundant gas in solar system 2 helium B Rocky and metallic material high melting temperature 700o C 1 silicate minerals like igneous rocks 2 pure metals and alloys mostly iron and nickel C ices of things besides water intermediate melting temperature 1 Ammonia NH3 2 Methane CH4 3 Carbon dioxide CO2 4 Water H2O D Nebular cloud hypothesis of Solar System formation explains why inner planets and outer planets are different temperatures and melting temperatures III Planetary information A Mercury 1 Innermost planet 2 smallest planet 4880 km diameter 3 orbit a inclined 7o to Sun s equator b highly eccentric 45 million km to 70 million km c Revolves quickly Orbital period 88 Earth days d Rotates slowly 3 rotations in 2 orbits 1 179 Earth days for one Mercury mean solar day Solar System Tour 2006 10 05 Page 1 of 9 2 Table 21 1 says 59 days that s a sidereal day WHAT S THAT 4 No atmosphere but trace of hydrogen and helium 5 Surface a cratered highlands and vast smooth terrains b scarps suggest crustal shortening c Extreme temperatures 1 Cold nights 280 F 2 Hot days 800 F 6 Very dense large iron core 7 Mariner 10 photo mosaic 1974 went to Venus first B Venus 1 motion a Orbit 225 days text citation is in error b Rotation is 243 Earth days and retrograde turns



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