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Notes - -mass of planet-impacting planetismals-orbital...

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Troposphere- weather, greenhouse gases trap radiation, convection happens Stratosphere- no convection, absorbs UV Ionosphere – thermosphere – ionizes gases Exosphere – top of at. , “escape route” Earth is habitable because greenhouse gases(hydrogen & carbon dioxide) warm planet above freezing by trapping radiation Surface of earth releases sun’s energy as infrared radiation Mercury & Moon are small so don't really have atmos. Venus, Earth, and Mars have atmospheres the giant planets(Jupiter & Saturn) have thick atm. close to the sun's Summary: NONE of the terrestrial planet at. are solar Most heat in universe comes from Sun, occurring mostly at visible wavelengths where sun is brightest -cools by radiating to space at infrared wavelengths -if rate of radiation into space is lower than rate of absorption of incoming energy, surface heats -final temp. = equilibrium point where the heating rate = cooling rate Key factors that decide whether a planet has an at or not: -temp of at.
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Unformatted text preview: -mass of planet-impacting planetismals-orbital distance from sun Unstable factors of an at:-water vapour-snow & sea ice- if it melts it reduces albedo-cloud cover-reduction in cloud cover causes warming Jupiter – huge mass Saturn-low density Mars-closest to sun Coriolis effect- twisting of a rotating body-clockwise in northern hemisphere, counter in southern Circulation cells combine w/Coriolis effect to get trade winds Moons: Jupiter: Europa – may have had water below icy surface, magnetic field supporst idea that there’s currently a liquid ocean beneath its surface Io-gets its heat from elliptical orbit Ganymede-own magnetic field Every 7 days Io, Europa, & Ganymede line up(have different oribital periods) Saturn: Largest moon is Titan-only satellite w/sig. Atmosphere-largely nitrogen – has water ice & methane springs-river channels, lakes from presumed cycle of liquid methane Enceladus spews vapour that’s ionized and effects Saturn’s magnetosphere...
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