Lecture 19- Extraterrestrial Life

Lecture 19- Extraterrestrial Life - Lecture 19-...

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Lecture 19- Extraterrestrial Life -Speed of light is approximately 1.1 billion km/h -One light year is approximately 9,460,730,472,580 km (9.5 trillion km!) -Proxima Centuri is our closest star (4.2 light years away); it would take 15,000 years to get to Proxima Centura -Mars Lander: 31000 km/h *We cannot travel anywhere in the universe* Radio astronomy - Radio waves (stars and stellar objects emit radio waves) - Advanced civilizations emit radio waves - SETI: the search for extraterrestrial intelligence - Radio waves use electromagnetic radiation, travel the speed of light The Drake Equation = × × × × × × N Ns fp ne fl fi fc L N – Number of advanced civilizations in our galaxy Ns - Number of stars fp - The fraction of those stars that have planets ne - Number of planets that can potentially support life fl - The fraction of those planets that develop life fi - The fraction of planets that develop intelligent life fc - The fraction of planets willing and able to communicate L- The expected lifetime of such a civilization
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This note was uploaded on 04/04/2009 for the course HISTORY 1401 taught by Professor Nathans during the Spring '09 term at UWO.

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Lecture 19- Extraterrestrial Life - Lecture 19-...

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