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XXX201X.X.XQuestionWhatarethenamesoftheeightplanetsofthesolarsysterm?Mercury水星Venus金星Earth地球Mars火星Jupiter木星Saturn土星Uranus天王星Neptune海王星MarsMarsisthefourthplanetfromtheSunintheSolarSystem.MarsisnamedfortheRomangodofwar,presumablybecauseofitsdistinctlyreddishcolor.MarsMarsEquatorialradius：3397.2kmQuality：6.4219×10^23kgEquatorialradius：6372.8kmQuality：5.98×10^24kgMars'diameterisonlyabouthalfanditsmassaboutone-tenththeEarth's.Marshaspolaricecapsandcloudsinitsatmosphere,seasonalweatherpatterns,volcanoes,canyonsandotherrecognizablefeatures.However,conditionsonMarsvarywildlyfromwhatweknowonourownplanet.MarsVolcanoonMarsSpringofMarsLifeonMars?AmongourdiscoveriesaboutMars,onestandsoutaboveallothers:thepossiblepresenceofliquidwateronMars,eitherinitsancientpastorpreservedinthesubsurfacetoday.WateriskeybecausealmosteverywherewefindwateronEarth,wefindlife.PicturesofchannelsprobablycarvedbyrunningwateronMarsLifeonMars?ColourviewofcraterwithwatericeMarsExploration“Spirit”Marsprobe（勇气号）TimeofLaunch:2003.6.10TimeofLanding:2004.1.4“Opportunity”Marsprobe（机遇号）TimeofLaunch:2003.7.7TimeofLanding:2004.1.25NASA：美国宇航局MarsExploration“Curiosity”Marsprobe（好奇号）TimeofLaunch:2011.11.26PlannedTimeofLanding:2012.8ProtecttheEarthTHANKSTHANKS