From: John Harney <magonia.nul> Date: Sat, 15 Dec 2012 15:00:35 -0000 Archived: Sat, 15 Dec 2012 10:23:53 -0500 Subject: Re: Update To Our View Of The Drake Equation >From: Edward Gehrman <egehrman.nul> >To: <post.nul> >Date: Fri, 14 Dec 2012 08:08:53 -0800 >Subject: Re: Update To Our View Of The Drake Equation >>From: David Rudiak <drudiak.nul> >>To: post.nul >>Date: Thu, 13 Dec 2012 10:22:33 -0800 >>Subject: Re: Update To Our View Of The Drake Equation >>Quite! There is the hidden assumption in these calculations that >>interstellar migration is impossible. This is not a scientific >>assumption but dogma. There are many conceivable ways that such >>migrations could take place without resorting to assumptions of >>Star Trekian warp drives, but at sub-light speeds. >>E.g., assume machine intelligence and length of travel doesn't >>really matter. Time to nearest star at a very modest 1% light >>speed is then less than 500 years. NASA propulsion experts for >>years have been thinking in terms of 10% light speed for a >>probe. >If Einstein is correct, then travel by even a grain of sand, >using external energy (so fuel wouldn't have to be carried), at >the speed of light would require all the energy in the universe. >So if we travel at 10% of the speed of light, does that require >10% of the energy in the universe? And that's just to power a >grain of sand. To put it as simply as possible, the relativistic mass of an object increases exponentially as it approaches the speed of light, thus the amount of energy required to accelerate it also increases exponentially, and becomes infinite at the speed of light. At 10% of the speed of light the effect would be still quite small. There is plenty of information about special relativity on he Internet. >Under these circumstances, I don't think star travel is probable >or will ever be possible. Yes we have visitors, but a more >mundane explanation is possible: we share our planet with an >ancient civilization. If an ancient civilization shares our planet, how is it we don't keep bumping into these people? John Harney Listen to 'Strange Days... Indeed' - The PodCast At: http://www.virtuallystrange.net/ufo/sdi/program/ These contents above are copyright of the author and UFO UpDates - Toronto. They may not be reproduced without the express permission of both parties and are intended for educational use only.
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