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Mars

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Mars

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Presentation Transcript

  1. Mars

  2. Essential Points • Mars is about half the size of Earth • Mars has a thin carbon dioxide atmosphere • Mars has volcanoes and faults but no plate tectonics • Mars had liquid water early in its history • Evidence for life on Mars is debatable

  3. Mars • About half the size of Earth • Rotates in 24.5 hours • Ranges from 207 to 249 million km (129 to 155 million miles) from Sun • Period: 687 days • Two tiny satellites

  4. Mars and Earth

  5. The Surface of Mars • Thin carbon dioxide atmosphere about 1/150 as dense as Earth’s • Surface temperatures -20 to -200 C • Polar caps of ice and frozen carbon dioxide • Large rift valley (Vallis Marineris) • Huge Shield Volcanoes (Olympus Mons) • Evidence for former liquid water

  6. Mars as Lowell Knew It

  7. Lowell’s Mars

  8. Lowell’s Venus

  9. Modern Imaging Technology Improves Earth-Based Views of Mars Greatly

  10. Mars from Mariner 9

  11. Mars Viking Mosaic

  12. Mars Topography

  13. Vallis Marineris

  14. Huge Landslide in Vallis Marineris

  15. Layered Deposits in Vallis Marineris

  16. Active Landslide on Mars

  17. Active Landslide on Mars

  18. Olympus Mons

  19. Summit of Olympus Mons

  20. Phobos over Olympus Mons

  21. Mars’ Polar Caps

  22. Polar Cliffs on Mars

  23. Dunes on Mars

  24. Water on Mars

  25. Channels on Mars

  26. Floods on Mars

  27. Where’s the Water Now?

  28. Recent Water on Mars?

  29. How to Lose an Ocean • If water is exposed to solar UV and particles, it breaks down to H + O (photo-dissociation) • Happens if water gets into upper atmosphere • Planet gets hot (Venus) • Planet loses atmosphere (Mars) • Oxygen combines with iron and other elements, on Mars may also have escaped

  30. Landing on Mars

  31. Mars as Seen by Viking

  32. Mars from Pathfinder

  33. Martian Winter

  34. Martian Sunset

  35. Layered Rocks on Mars

  36. Cape St. Vincent

  37. Opportunity’s Shadow

  38. Spirit Makes Tracks

  39. Digging Out

  40. Hole on Mars

  41. Wind Erosion on Mars

  42. Ice in Martian Crater

  43. Martian Glacier?

  44. Martian Glacier?

  45. Martian Dust Devil

  46. Dust Devil Tracks

  47. Phobos and Deimos

  48. Phobos and its Shadow

  49. Martian Solar Eclipses

  50. Earth From Mars