From: Adam Safron (asafron@gmail.com)
Date: Fri Aug 24 2007 - 12:04:06 MDT
If we are now seeing the light from 6-10 billion years ago, then how
can we be sure the void isn't (still) expanding? If that particular
void has stopped expanding (it seems like a difficult thing to test),
then that doesn't bode well for the exponentially expanding
intelligence (EEI) theory of intergalactic voids; if star-harvesting
was a good idea for a billion years, it probably would continue to be
a good idea. In that case, I guess the gravitational lumpiness
theory wins; though some of the voids may still be explained by EEI
theory.
Since complexity friendly planets may be rare in the early universe,
EEI theory would predict fewer voids from that period. I wonder if
this is true...
Unfortunately, I know very little about astronomy, so I'm probably
wrong about most/all of this and the explanation is much less exotic/
exciting that my imagination.
Thanks,
Adam
On Aug 24, 2007, at 11:59 AM, Jeff L Jones wrote:
> On 8/24/07, Adam Safron <asafron@gmail.com> wrote:
>> galactic voids. Considering the size of interstellar voids (even
>> this big one) and the age of the universe, it seems that expanding
>> intelligences could create voids this size with relatively modest
>> assumptions about the speed of expansion for the civilization.
>
> Hmmm... this giant hole they're talking about is 6-10 billion light
> years from us. Which means it's about 4-8 billion light years after
> the big bang. They say the size is nearly a billion light years
> across. So that means the civilization would have had to come to
> maturity 3-7 billion years after the big bang and then spend at least
> a billion years colonizing the region and harvesting all the matter.
> That seem pretty early for intelligent life to develop, but maybe.
> Although if it did, then why did they stop there rather than continue
> for the next 6-10 billion years colonizing other regions around it?
>
> Jeff
>
>>
>> At the edge
>> of interstellar voids, do we see stars mysteriously flicker and then
>> disappear? What percentage of the stellar output could be feasibly
>> absorbed/harvested? Of course this will depend on the specific
>> stellar-system in question. If possible, how many years would it
>> take a super-intelligence to block the radiation from a star?
>
> It's not the radiation from stars they are looking at. They mention
> the dark matter is completely missing too, which means they detected
> this hole by looking at the gravitational lensing effects (or lack
> thereof, in this case). So blocking radiation from just the stars
> would not be able to hide the matter or the dark matter from us. They
> would have to build some sort of gravitational shielding device that
> cancels out the effects of gravity so we don't see them... or
> something that unbends the light passing through the region so that it
> looks like the space there is curved differently than it is. If such
> technology exists, it would be a sign of an extremely advanced
> civilization.
>
> Jeff
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