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Location: UFOUpDatesList.Com > 2012 > Dec > Dec 15

Re: Update To Our View Of The Drake Equation

From: Michael Tarbell <mtarbell.nul>
Date: Fri, 14 Dec 2012 15:36:08 -0700
Archived: Sat, 15 Dec 2012 10:20:15 -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.

>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.


Ed,

At 0.1c, the relativistic change in mass is ~0.5%, which I think
may be reasonably neglected. The energy required to bring a
typical (0.01 gm) grain of sand to 0.1c is thus on the order of
(0.5)x(.01gm)x(3x10^9cm/sec)^2, or ~4.5 gigajoules. This is
equivalent to the detonation of ~1 ton of TNT, not a trivial
amount, but substantially less than 10% of the energy in the universe.

If this has been the basis of your pessimism about interstellar
travel, you may want to reconsider. Although, if interstellar
travel is occurring routinely, I must say I'd be surprised if
the brute-force acceleration of mass were the predominant
technique.


Mike


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