bio lecture notes

bio lecture notes - Biology September-22-08 One product of...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Biology September- 22-08 One product of the Miller- Urey experiment was simple polypeptide chains (FALSE there were only monomers) Frank Drake Equation N = N × f × n × f × f  × f × L N = Number of advanced civilizations in our galaxy N = Number of stars f = the fraction of those stars that have planets n = number of planets that can potentially support life f = the fraction of those planets that develop life f = the fraction of planets that develop intelligent life f = the fraction of planets willing and able to communicate = average lifetime of a civilization - N s – Set our estimate to 100 billion stars (low estimate) - f – What fraction of starts have planets? – Transit method – Astometry/Doppler spectroscopy (wobble) – Direct imaging - So far we have found 310 extrasolar planets but they are very big - Planet formation is a natural occurance when a star is formed - set fp = 0.5 (1/2 of the stars)
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
10 11 x0.5 = 50 billion stars have
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/04/2009 for the course BIOLOGY 1222 taught by Professor Haffie during the Spring '09 term at UWO.

Page1 / 3

bio lecture notes - Biology September-22-08 One product of...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online