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Chapter 7

Chapter 7. Survey of Astronomy. Astro1010-lee.com. Our Barren Moon. twlee2016@gmail.com. Chapter 7. Our Barren Moon. Survey of Astronomy. Astro1010-lee.com. twlee2016@gmail.com. Chapter 7. Our Barren Moon. Survey of Astronomy. Astro1010-lee.com. twlee2016@gmail.com. Chapter 7.

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Chapter 7

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  1. Chapter 7 Survey of Astronomy Astro1010-lee.com Our Barren Moon twlee2016@gmail.com

  2. Chapter 7 Our Barren Moon Survey of Astronomy Astro1010-lee.com twlee2016@gmail.com

  3. Chapter 7 Our Barren Moon Survey of Astronomy Astro1010-lee.com twlee2016@gmail.com

  4. Chapter 7 The seismograph placed on the Moon by the Astronauts of the Apollo Program Survey of Astronomy Astro1010-lee.com twlee2016@gmail.com

  5. Chapter 7 Does the moon rotate? What if the Moon did not rotate? Survey of Astronomy Astro1010-lee.com twlee2016@gmail.com

  6. Chapter 8 Our Barren Moon Synchronous Rotation One rotation for one revolution Survey of Astronomy Astro1010-lee.com twlee2016@gmail.com

  7. Chapter 7 Lunar Phases as described by Aristotle We only see the lighted portion of the Moon Survey of Astronomy Astro1010-lee.com twlee2016@gmail.com

  8. Chapter 7 Surface Features Craters on the Moon and the Earth Impact Maria, Basins, Rays Impact and volcanism Rills and Domes Volcanism Survey of Astronomy Astro1010-lee.com twlee2016@gmail.com

  9. Chapter 7 Our Barren Moon Craters, Maria and Basins are all due to meteorite impact Survey of Astronomy Astro1010-lee.com twlee2016@gmail.com

  10. Chapter 7 • Moon has large dark flat areas, due to impact and lava flow, called maria or basins (early observers thought they were oceans or seas) Survey of Astronomy Astro1010-lee.com twlee2016@gmail.com

  11. Chapter 7 Our Barren Moon Craters have round bottoms, flat bottoms and flat bottoms with a hump depending on the energy deposited. Survey of Astronomy Astro1010-lee.com twlee2016@gmail.com

  12. Chapter 7 Our Barren Moon Far side of Moon has some large craters, but no large maria. The reason for this difference is still not fully understood. Survey of Astronomy Astro1010-lee.com twlee2016@gmail.com

  13. Chapter 7 Meteoroid strikes Moon, ejecting material; explosion ejects more material; leaving crater, lips (rim) and ejecta Survey of Astronomy Astro1010-lee.com twlee2016@gmail.com

  14. Chapter 7 Regolith: The surface of the moon is heavily cratered. One of the results of the infalling bodies is to pulverize the surface, thus creating a layer debris, much of it is very fine dust. The surfaced is layered with debris on top of pulverized rock. Survey of Astronomy Astro1010-lee.com twlee2016@gmail.com

  15. Chapter 7 Our Barren Moon Most lunar craters date to at least 3.9 billion years ago; much less bombardment since then. Craters are typically about 10 times as wide as the meteoroid creating them, and twice as deep as they are wide. Survey of Astronomy Astro1010-lee.com twlee2016@gmail.com

  16. Chapter 7 Early Intense Bombardment Survey of Astronomy Astro1010-lee.com twlee2016@gmail.com

  17. Chapter 7 Our Barren Moon Moon is still being bombarded by very small objects called “micrometeorites” which trends to round the edges of craters and leave a layer of dust. Survey of Astronomy Astro1010-lee.com twlee2016@gmail.com

  18. Chapter 7 Meteorites also hit Earth; this crater is in Arizona Survey of Astronomy Astro1010-lee.com twlee2016@gmail.com

  19. Chapter 7 Our Barren Moon The great “lakes “ of liquid rock that filled the large craters are greatest evidence of vulcanism on the moon. Vulcanism ceased when the moon cooled. Survey of Astronomy Astro1010-lee.com twlee2016@gmail.com

  20. Chapter 7 This is an edge of a mare. The sooth appearance is due to the lava that flowed up through cracks , smoothed out then cooled. Survey of Astronomy Astro1010-lee.com twlee2016@gmail.com

  21. Chapter 7 Hadley Rill seems to be an extended lava tube whose roof has fallen in. There are other caved in lava tubes but they are much shorter, Survey of Astronomy Astro1010-lee.com twlee2016@gmail.com

  22. Chapter 7 Survey of Astronomy Astro1010-lee.com Field of Domes twlee2016@gmail.com

  23. Chapter 7 Survey of Astronomy Astro1010-lee.com Moon’s density is relatively low, and it has no magnetic field – cannot have sizeable iron/nickel core. Due to cooling over time the crust has thickened. twlee2016@gmail.com

  24. Chapter 7 Why Air Sticks Around • Air molecules have high speeds due to thermal motion. If the average molecular speed is well below the escape velocity, few molecules will escape. • Escape becomes more probable: • for lighter molecules (higher speed for same kinetic energy) • at higher temperatures • for smaller planets (escape speed is less) Survey of Astronomy Astro1010-lee.com twlee2016@gmail.com

  25. Chapter 7 Early theories of the origin of the Moon Survey of Astronomy Astro1010-lee.com twlee2016@gmail.com

  26. Chapter 7 The currant, post Apollo, theory is the Collision Ejection Theory. Two large planetismalscollide. Their crusts splash, their interiors merge. The merged interiors become the Earth. The splashed crustal material becomes the Moon. Survey of Astronomy Astro1010-lee.com twlee2016@gmail.com

  27. Chapter 7 Survey of Astronomy Astro1010-lee.com This theory accounts for the difference in density of the Moon and Earth, the reason for the high percentage of iron in the Earth, and the strange orbital placement. twlee2016@gmail.com

  28. Chapter 7 The early history of the moon includes the Early Intense Bombardment which is the last step in the accretion process. Survey of Astronomy Astro1010-lee.com twlee2016@gmail.com

  29. Chapter 7 Survey of Astronomy Astro1010-lee.com twlee2016@gmail.com

  30. Chapter 7 Our Barren Moon End Chapter 8 Survey of Astronomy Astro1010-lee.com twlee2016@gmail.com

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