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The Moon

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					                                                            11/7/2009




   The Moon

Our satellite - What’s it like?

No Atmosphere - that’s pretty easy. Or is it?
No temperature regulation
          Daytime temperature = 400 K (266 F)
          Nighttime temperature = 100 K (-280 F)




                     Surface Features
Craters
Mare - dark, smooth regions
Craters
Highlands - lighter colored, rough terrain
Craters
“Mountains”
Craters
Volcanic features
And of course, Craters




           Craters

Oh I give up!                     Mountains

                                                Highlands
                                  Mare




                                              Mare




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               Mare - circular edges
               What are they?




                                       Areas without mare
                                       Heavily cratered
                                       highlands




Impact made basin (big crater)
Lava filled basin  Mare
Later impacts occurred
Mare are younger (newer) than
highlands




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                      Faults




                           Rille




                 Structure of the Moon
   Composition of the Moon similar to the Earth’s Mantle
   Very little metal (iron, nickel), mainly rock



 Crust
 Mantle

Iron-rich core




                         Lunar Crust




          Near side                                Far side




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    Thinner crust on Near Side allows formation of Mare




                       Tidal Effects
Tidal effects - gravity
Moon pulls Earth      Earth pulls Moon
Moon’s pull ocean tides
Earth’s pull slows Moon’s rotation
Tidally locked = one side always faces planet
Moon’s pull slows Earth’s rotation
Earth’s pull slows Moon’s orbital velocity
Far in the future:
        The Moon will be very far
        Earth and Moon both tidally locked




                                         Apollo Mission
                                         6 lunar landings
                                         12 people walked on the
                                         Moon (and played golf)
                                         850 pounds of rocks




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                                           All near side landings
                                           Lunar rover




                       Lunar Rocks
         Basalts




                                  Anorthosites




                      Breccia




                Origin of the Moon
Moon’s composition = Earth’s Mantle
Two large objects not likely
Moon used to be closer, Moon is younger
Possible scenario - the Impact Theory
History of the Moon
       4.5 billion years ago - Moon formed (after Earth)
       4.5 - 4 b.y.a. - large impacts formed basins
       3.5 - 3 b.y.a. - basins filled with lava forming mare
       1969-1972 - Apollo missions
       2009 – New studies (any water?)




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posted:10/17/2011
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