L07 - What'supUniverse In2012,arewedoomed ,SolarSystem...

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Unformatted text preview: What'supUniverse? TheStrongestSolarFlare In2012,arewedoomed? UnderstandingOurWorld,SolarSystem Chap4 8kpc lyr SolarSystemLayout(1) 30AU 100AU 105AU Launchedin1977 V=20,000m/s AsofAug2006 OortCloudisahypothePcalshellwhichiscomposedofnumerous cometlikebodies. NaturalSounds 115images MusicalSelecPons SpokengreePngsin55laguages SolarSystemLayout(2) GeneralProperPesofSolarSystem Over99%ofmassoftheSolarSystemis intheSun. Twomaincategories 1)Earthlike,smallrockyplanets 2)Jupiterlike,biggaseousplanets GeneralProperPesofSolarSystem TheirorbitalmoPonscanbe describedbyKepler's planetarymoPons. 1)Theorbitalshapesof these8arenearlycircular 2)Alltheplanetsorbitthe SuninthesamedirecPon 3)Theorbitalplanesarein nearlythesameplaneas Earth's **WhataboutPluto& Comets? GeneralProperPesofSolarSystem SmallMembersin ourSolarSystem Dwarfplanets Asteroids Comets Meteors GeneralProperPesofSolarSystem SmallerbodiesintheSolarSystem SolarSystemDebris Sizerangesfrompebblesizeto fewhundredkm Rocky(iron,silicate,nickel... etc)&icymaterials Randomshapesexceptdwarf planets(relaPvelymassivebodies) Bumpysurfacedueto numerouseventsofimpacts >>What'stheimplicaPon? Let'sputthesealtogether! OurSolarsystemappearstobeverywellarchitectedbyahighdegree oforderwithafewexcepPons. 1)IngredientsHydrogen,Helium,rocks&ice 2)BrutalcondiPonsSmallrockswithbumpysurface, irregularshapes 3)OrbitalmoPonsareconsistentMomentumconservaPon nearlycircularshapes samedirecPon nearlyinthesameplane thesealsoapplytothemoPonsofthemoons BasedontheseinformaPon,Astronomerscameupwithatheoryofthe SolarsystemformaPon lot'sofgas dense&caoPcenvironment rotateinconsistentway FormaPonof theSolarSystem: NebularTheory ItallstartsfromStars... 1)StellarwindsorSNe 2)Interstellardust,condensaPon 3)GiantMolecularCloud 4)GravitaPonalContracPon 5)RotaPonbytheconservaPon oftheangularmomentum 6)Protostellardisk Whathappens intheprotostellar disk? 1)AccrePon >>"Planetesimals" >>"Protoplanets" >>Planets 2)Collisions& FragmentaPon >>asteroids&comets 3)Innerregion:metallic core+rockyenvelop outerregions:icycore+ gaseousenvelop DoweseethesefromobservaPon? StarFormingRegion This Nebular Theory seems to explain almost every aspects of the Solar systemfairlywell. So... is the Nebular Theory a good theory? Does it also can describe the general properPesoftheexoplanets? Among~760 Exoplanetarysystems thereisnosystem similartotheSolar system! SelecPonEffect? PlutoControversy:IsthePluto controversyisascienPficcontroversy? FirstpredictedbyNewtoniandynamicsin1890s,Plutowasdiscovered inMarch1930atLowelObservatoryinArizonabyClydeTombaugh. ThebestPlutoimagesofar NewHorizonMission:launchedin2006,flybyPlutoin2015 Quiz#1,Jan26,2012 1.PtolemyrevisedAristotle'sgeocentricmodelbyintroducing"Epicycle". 2.Ptolemy'sgeocentricmodelwasagoodenoughtotoexplainalmostevery aspectsoftheplanetarymoPons.Butwhyhismodelisnota"great"theory? Brieflystatewith1sentence."Itgetscomplicatedwhenevernewstuffscomein." 3.Kepler's1stlaw:Theorbitalpathsoftheplanetsare"ellipses"withthe "Sun"atonefocus. 4.Aplanetlocatedat3AUwillrequireapproximately"~5"yearsto orbittheSun.ClearlyshowyourcalculaPon. 5.Wecanspeculatewhetheranexoplanetisrockyorgaseousbymeasuring its"density". 6.BrieflystatethegeneralproperPes(atleastthree)oftheExoplanetarysystems. 7.WhatisthebiggestchallengeforgroundbasedobservaPons?"Atmosphere" 8.(T/F)TheradialvelocitymethodisadirectwaytodetectExoplanets. 9. Youobserveanobjectandgotthisspectrum.Tellmeabout thephysicalcondiPonsaboutthisobject."Hot&densebody+cold&diffusegas" 10.DopplerEffect:Whenthelightsourceismovingtowardtoanobserver,the observersees"blueshixed(orshortened)"wavelengththannormal. ...
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This note was uploaded on 02/15/2012 for the course AST 1002 taught by Professor Dr.haywoodsmith,jr during the Spring '07 term at University of Florida.

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