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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