Honors Physics Preview for the Year Mr. Finn Fall, 2013 Take TWO slips of paper.

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Presentation transcript:

Honors Physics Preview for the Year Mr. Finn Fall, 2013 Take TWO slips of paper

Are We Alone? Milky Way 1.Is the Earth the only planet in the Milky Way galaxy harboring life? Universe 2.Is the Earth the only planet with life in the entire Universe? Milky Way Ultra-Deep Hubble Field Write TWO answers on separate slips of paper: Yes, No, or Maybe

Drake Equation N = # planets with advanced civilizations N * = # stars in galaxy f P = fraction of stars with planets n e = # “earth-like” planets orbiting stars with planets f L = fraction of “earth-like” planets with life f I = fraction of planets developing “intelligent” life f C = faction of planets developing “advanced civilizations” L = life time of “advanced civilizations” T = age of galaxy How can we find values?

Values in Drake Equation N = ____________________ N * = ____________________ f P = ____________________ n e = ____________________ f L = ____________________ f I = ____________________ f C = ____________________ L = ____________________ T = ____________________

Fermi Paradox Any “modestly” advanced civilization could colonize the Galaxy in ~10 million yr?! – space ships v  10% c (speed of light) – colonies sent out more colonies every 100 yr – 10  10 6 << 13  10 9 (age of Galaxy) – conclusion insensitive to assumption “Where is EVERYBODY??”

What happened to all the trash cans in New York City? (New Yorker Magazine, 1950) New Yorker cartoon

Catalyst

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