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ASTR/GEOL 3300: ET Life

ASTR/GEOL 3300: ET Life. Logistics: Pick up old homeworks please (HW8 due next week.) IF YOU HAVEN’T ALREADY DONE SO : turn in your revised paper proposals This will be graded. Midterm #2 on November 8 OPEN-NOTES, OPEN-BOOK. All material from Aug. 23 to Nov. 5. Plan for Today:

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ASTR/GEOL 3300: ET Life

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  1. ASTR/GEOL 3300: ET Life • Logistics: • Pick up old homeworks please (HW8 due next week.) • IF YOU HAVEN’T ALREADY DONE SO: turn in your revised paper proposals This will be graded. • Midterm #2 on November 8 OPEN-NOTES, OPEN-BOOK. All material from Aug. 23 to Nov. 5. • Plan for Today: • Habitable zones • Europa and the Icy Moons

  2. As the Sun increases its luminosity with time, the Habitable Zone moves outward…

  3. Death of the Earth

  4. Icy worlds • Before, during and after the “Continuously Habitable Zone”

  5. Europa & the Galilean Satellites

  6. The Galilean Satellites

  7. Io: The Volcanic Moon • Solar System's most volcanically active world! • Why so colorful? • Red & yellow sulfur. • Dark volcanic flows. • Bright SO2 frost. • No impact craters have been found: • Very active and youthful surface. • Very warm interior.

  8. Io: The Volcanic Moon • Volcanic plumes! • Volcanic flows!

  9. Io: The Volcanic Moon • Extreme geology in action!

  10. Why So Hot? Tidal Heating! • Tidal heating keeps Io hot! • Jupiter's gravity stretches Io, creating tidal bulges. • During Io's eccentric orbit about Jupiter, the tidal bulges grow when Io is closer, and shrink when Io is farther. • Tidal bulges also "nod" from side-to-side. • This flexing generates heat. • Tidal heating generates enough heat energy to melt rock and power Io's volcanoes. not to scale

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