ETI_2 - Interstellar Travel Search for Extraterrestrial...

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Interstellar Travel Search for Extraterrestrial Intelligence Stephen Eikenberry 23 November 2010 AST 2037 1
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Interstellar Travel: Why Bother? It is already hard enough just to send messages to other civilizations! hygotothehassleofflyingthere? Why go to the hassle of flying there? Soft, fuzzy answers: Humans have always felt the need to explore in person ven today world leaders forgo telecoms for Even today, world leaders forgo telecoms for important deals – travel in person instead for face- to-face meeting (face-to-tentacles here?_ Real answer: If you can’t actually GO there, it is pretty hard to kill them and take their stuff! 2
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Current Rocket Travel Time 3
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Our Friend: Time Dilation So … at v = 0.5c, we on Earth see a trip to Cen take 6 years each way But, the astronaut on the ship sees it take about 5 years each way (!) ow try v=0 99c Now, try v=0.99c We see it takes 3 years each way Astronaut sees it take about 6 weeks each way (!) Twin paradox: one twin on Earth ages 6 years during the und- ip the other twin ages only 3 months (!!) round trip, the other twin ages only 3 months (!!) 4
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Light Speed: Rocket Trouble Energy of flying mass is mc 2 To deliver payload mass m 1 , need enough fuel to slow-down and stop it For nuclear fusion (VERY efficient), this is 0.007 m
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ETI_2 - Interstellar Travel Search for Extraterrestrial...

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