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Comparing the Planets 15 October 2012.

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Presentation on theme: "Comparing the Planets 15 October 2012."— Presentation transcript:

1 Comparing the Planets 15 October 2012

2 Mars Venus Mercury Earth Moon Terrestrial Planets

3 4 geological processes:
Impacts Volcanism Tectonics Erosion

4 Density -> clue about size of core
Planet Measured Density [g cm-3] Uncompressed* Density [g cm-3] Mercury 5.43 5.3 Venus 5.24 4.0 Earth 5.515 4.1 Moon 3.36 3.3 Mars 3.94 3.7 Density -> clue about size of core

5 Processes that HEAT planets

6 Processes that COOL planets
Eruptions!

7 Lunar Catacysm: Late Heavy Bombardment

8

9 Stages in evolution lead to the Late Heavy Bombardment

10 Surface of Mercury

11 Mercury craters

12 Lunar Far side

13 Mars craters

14 Meteor Crater Arizona

15 Venus Pancake Domes

16 Galapagos Islands

17 Mars lava flow

18 Mars channel

19 Dendritic Tributaries in Yemen

20 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

21 Size makes a difference
Small planets cool Large planets remain active

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