Comparing the Planets 10 October 2011. Mercury Venus Earth Moon Mars Terrestrial Planets.

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Presentation transcript:

Comparing the Planets 10 October 2011

Mercury Venus Earth Moon Mars Terrestrial Planets

4 geological processes: Impacts Volcanism Tectonics Erosion

PlanetMeasured Density [g cm -3 ] Uncompressed* Density [g cm -3 ] Mercury Venus Earth Moon Mars Density -> clue about size of core

Processes that HEAT planets

Processes that COOL planets Eruptions!

Lunar Catacysm: Late Heavy Bombardment

Stages in evolution lead to the Late Heavy Bombardment

Surface of Mercury

Mercury craters

Lunar Far side

Mars craters

Meteor Crater Arizona

Galapagos Islands

Mars lava flow

Mars channel

Dendritic Tributaries in Yemen

Common factors for the terrestrial planets Hot formation External bombardment Internal processes lead to tectonics Basaltic lava flows Cooling: Moon, Mercury senescent Mars middle years show continuing activity Earth and Venus still active

Size makes a difference Small planets cool Large planets remain active

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