Lecture 004 Summary

Lecture 004 Summary - of a star), astometry/Doppler...

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Lecture 004 – The Drake Equation Milky Way Galaxy very wide, closest star (Proxima Centauri) very far distance. SETI – Search for Extra Terrestrial Intelligence N = N S X f p X n e X f l X f I X f C X L o N = number of advanced civilizations in our galaxy o N S = number of stars o F p = the fraction of those starts that have planets o N e = number of planets that can potentially support life o F l = the fraction of those planets that develop life o F i = the fraction of planets that develop intelligent life o F c = the fraction of planets willing and able to communicate o L = average lifetime of a civilization Planets in other solar systems can be detected by the transit method (when a planet moves in front
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Unformatted text preview: of a star), astometry/Doppler spectroscopy (detecting wobbling effect when planet moves around the star), and direct imaging (directly seeing it, using telescopes). Habitable zone area in solar system that would be suitable for life. Water is the biggest criteria for life. It is polar covalent (unequal sharing of electrons). Water has hydrogen bonding, which takes a lot of energy to break. Water is highly cohesive, has a high heat capacity, and a high heat of vaporization (stays liquid to relatively high temperatures). Hydration shells caused by water minimize electric charge, acting as a buffer....
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