INTRODUCTION TO ASTRONOMY
INTRODUCTION TO ASTRONOMY AST 301
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This 5 page Class Notes was uploaded by Keegan Goyette on Sunday September 6, 2015. The Class Notes belongs to AST 301 at University of Texas at Austin taught by Donald Winget in Fall. Since its upload, it has received 9 views. For similar materials see /class/181759/ast-301-university-of-texas-at-austin in Astronomy at University of Texas at Austin.
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Date Created: 09/06/15
Mercury amp Venus 9202011 51300 PM Mercury s Orbit Mercury amp Venus don t get very far from the sun because they re inside the earth s orbit Mercury in Transit across the Sun Lowell Observatory Photos Showing Phases of Mercury Phases of mercury waning and gibbous show that it actually is in orbit around the sun Mercury Fact Sheet Physical Properties relative to Earth You would feel light walking around on mercury Sidereal rotational period is 59 Earth days Orbital period 88 Earth days Solar day is 176 Earth days Tidal locking because of proximity to Sun and oblong shape elliptical orbit influences locking very eccentric orbit closer than the sun so it is has much larger tides Not keeping the same face closest to the sun Surface Geology Fact Sheet Heavily cratered very Moonlike impact craters and lava seas global Bfield 001 Earth s and high density fluid iron core Essentially m atmosphere a few trace gases from solar wind day temperatures OVER 600 degrees Fahrenheit night temperatures UNDDER 270 degrees Fahrenheit Mariner 10 reveals heavily cratered surface similar to the moon Mercury Rays extending from pair of craters about 40 km across Caloris Basin similar to moon 6000 foot cliffs Discovery Scarp As mercury was cooling down the surface layer cooled very quickly scarps formed as crust compressed from cooling thinner lithosphere than the Moon an more tectonic activity This is consistent with larger mass than Moon Venus Fact Sheet sister planet to earth but a wicket sister Retrograde rotation why Collision with moon size object It rotates on it axis because It got knocked silly to make it rotate the other way Sidereal rotational period is 243 Earth days Orbital period 225 Earth days Solar day is 117 Earth days tidal locking a factor but not wit the Sun with the Earth planets closer to the sun move faster farther away move slower THICK atmosphere mostly carbon dioxide 965 Venus is hotter than mercury but mercury is closer to the sun This is because of a runaway greenhouse effect causing global warming Sulfuric acids clouds time variable high pressure Lightening all over the place howling 200 mph winds Understanding Venus Carbon dioxide emitted by volcanoes Venus hotter so no liquid water oceans water molecules broken up by sunlight H lost where is 0 Maybe in rocks Carbon dioxide can t dissolve in oceans runaway greenhouse makes surface HO39I39I39ER THAN mercury even the night side the side away from the sun is awfully hot too Russian landers reveal new rocks and gentle surface breezes not like howling 200 mph winds higher up sent back images and then no more images melted destroyed cameras came back amp landed on land US lands in Ocean parachute landed on top of the CAMERAS Stupid Russians point is weather its US and Russians making mistakes we got really good data Thoughts on Venus and Comparative Planetology Slow rotation low Coriolis effect No large spiral storm patterns No detectable global magnetic field Diverse geology young rocks and features suggest recent volcanism consistent with mass similar to Earth s interior similar to earth Mars 9202011 51300 PM IF there s lava flow at the base of that there is a simple smaller channel You see that all over texas It shows multiple epics of flow A section of the VallesMarineris Canyon System 100 Km wide 10 Km deep the whole system is about the size of the continental united states Martian cliffs 9202011 51300 PM