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MERCUR Y


                        COMPOSITION OF ATMOSPHERE
                                          Principal constituents        EXTERNAL FEATURES AND INTERNAL
                                          helium and hydrogen                     STRUCTURE OF MERCURY
         Minor constituents
         sodium and oxygen
                          Traces of  neon, argon,
                          and potassium                                  Monteverdi
                                                           Thin crust                 Rubens
                                                                                           Vyãsa
        CRATERS AND PLAINS NEAR
        MERCURY’S NORTH POLE                      Mantle 375 miles           B OR E AL I S   Unmapped region
                                                  (600 km) thick            P LAN ITIA
                                                                                                 Praxiteles
                                    Borealis Planitia
                                    (smooth plain with a
                                    few young craters)
                                                                                                     Kuan
                                                                                                     Han-
                                                                                                     ch’ing
                                     Terrain with
                                     many old craters

                                                    Chong
                                             Heine  Ch’ol
                                    Strindberg
                   Maximum sunlit surface
                   temperature 800°F (430°C)
                             Van Eyck
                                                                                                  Polygnotus
                                                                                            Vivaldi
                               CALORIS BASIN                                             Iron core 2,250 miles

                                             PLANITLA
          Caloris Montes                    SOBKOU                                       (3,600 km) in
                                                                                         diameter, with 80%
               Balzac                                                                    of  Mercury’s mass
            Phidias
                                       BUDH
          Tyagaraja                  PLANITIA
                                                                                               Mantle of
          Philoxenus
                                                                                               silicate rock
             Zeami
              Goya                                                                             Crust of
                                                                                               silicate rock
           Sophocles
             Tolstoj                                                                           Renoir
             Vãlmiki
                                                                                            Minimum dark-side
               Milton                                                                       surface temperature
                                                                                            -270°F (-170°C)
               Liang K’ai
                                                                                          Chekhov

                   Beethoven                                                             Schubert
                           Bello                                                      Bramante
                                                                                Discovery Rupes
                             Shelley
                                                                            Coleridge
                                 Hawthorne                         Fram Rupes
                                          Michelangelo  Wagner  Bach

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