Bit of Administration ….

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Presentation transcript:

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

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

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

Life in the Galaxy Extrasolar Planets 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

Extrasolar Planets

Extrasolar Planets

Current Detection Limit

Extrasolar Planets

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

Life in the Galaxy Nciv = N* x fp x fe x fl x fc x flifetime 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