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Bit of Administration ….

Bit of Administration …. Washburn Observatory Wednesday, after dusk for a few hours Reading Chapter 24, Chapter 14 recommended Discussion Section Web-lecture in advance of section 2 pts extra credit for evaluation 3 pt extra credit quiz responsible for material Final

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Bit of Administration ….

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  1. Bit of Administration …. • Washburn Observatory • Wednesday, after dusk for a few hours • Reading • Chapter 24, Chapter 14 recommended • Discussion Section • Web-lecture in advance of section • 2 pts extra credit for evaluation • 3 pt extra credit quiz • responsible for material • Final • Sunday, May 9, 12:25-2:25, B102 Van Vleck

  2. Life in the Solar System • Arguments for Life as High Probability • Organic molecules form easily • Life occurred quickly on Earth - < 3.85 billion years • Life can exist in a wide range of conditions

  3. Life in the Solar System • Life on Europa ? • Icy crust • Tidal heating Liquid oceans Volcanic vents

  4. Extrasolar Planets Life in the Galaxy • Key Idea - With present technology, cannot “see” • an extrasolar planet due to • small angular separation and faintness • - Observing effects of planet ON star • Detection Methods • Doppler Method - most productive - 110 planets! • Radial-velocity variations (discussion section) • Astrometric • Angular motion of star in the sky • Planetary Transits • Eclipses • Gravitational Lenses

  5. Extrasolar Planets

  6. Extrasolar Planets

  7. Current Detection Limit

  8. Extrasolar Planets

  9. Extrasolar Planets Orbital Period 3.5247 days Semi-major axis 0.0468 AU Mass > 0.69 MassJup

  10. Life in the Galaxy • Drake Equation • Nciv = N* x fp x fe x fl x fc x flifetime Lib Con N* Solar-type stars in galaxy 1011 1011 fp Fraction of stars which have planets 1 0.1 fe Fraction that are earth-like (suitable for life) 1 0.01 fl Fraction on which life actually arises 1 0.01 fc Fraction that can and choose to communicate 1 0.01 1011 104 fl Survival time of civilization/age of galaxy 10-8 10-8 100 yr/1011 yr 1000 10-4 If 1000 civilizations, on average 100 ly apart

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