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Change of our veiw on ancient Mars

Water on Mars Okyama University 2007.06.18. Akos Kereszturi , PHD Collegium Budapest Eotvos Lorand University of Sciences Hungarian Astronomical Association e-mail: kru@mcse . hu. Change of our veiw on ancient Mars. Bone dry planet (Mariner-9). Change of our veiw on ancient Mars.

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Change of our veiw on ancient Mars

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  1. Water on MarsOkyama University2007.06.18.Akos Kereszturi, PHDCollegium BudapestEotvos Lorand University of SciencesHungarian Astronomical Associatione-mail: kru@mcse.hu

  2. Change of our veiw on ancient Mars Bone dry planet (Mariner-9)...

  3. Change of our veiw on ancient Mars …ancient channels (Viking probes)...

  4. Change of our veiw on ancient Mars …sometimes lakes (MGS)...

  5. Change of our veiw on ancient Mars …with a great northern ocean (MGS, MEX).

  6. H2O budget • Original H2O budget: • 20-400 m global coverage • Signs of liquid water: • channels, valleys • ocean shorelines • clay minerals • sediments deposited in water • theoretical models

  7. The poposed ancient ocean

  8. Channels by surface runoff or sapping

  9. Global cooling, surface freezing • Realtive small planetary mass: • small radioactive heat source • early stopped dinamo • weak gravity • fast atmospheric loss • decreasing greenhouse effect • decreasing volcanism • only early global tectonism • decreasing global temperature • formation of cryosphere

  10. Water break up, outflow channels

  11. Favourable periods for liquid water South Polar Cap - Argyre - Uzboi channel system sedimentary delta lake sediments

  12. Channel network  water source

  13. H2O distribution today • Almost all H2O is frozen: • 60-80 % subsurface permafrost • 10-30 % polar cap and polar sediments • 0,1-0,01 % atmosphere

  14. Signs of water today? - Gullies?

  15. Slope straks?

  16. DDS „seepages”?

  17. Possible conditions for water today • very rarely • who knows…

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