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Garrett Wiens-Kind 12 Dec 16
Curious if the energy pay off worth it to the civ to be revealed.. seems risky.
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Eerie KorBOOla 12 Dec 16
such a civilization would much more about the possible threat than we do.
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Garrett Wiens-Kind 12 Dec 16
Could also be.. a galactic honeypot? Catch someone's hand in the cookie jar?
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Ben Mazin 12 Dec 16
Replying to @Astro_Wright
I don't understand why the thermal IR is inevitable. What if they dump it into a black hole? Or radiate it non-isotropically?
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Jason Wright 12 Dec 16
Replying to @ben_amazin
I guess a black hole would work; not clear that there's always one around, and why not just radiate? Non-isotropic works.
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Jason Wright 13 Dec 16
Replying to @ben_amazin
But non-isotropic is inefficient in a Carnot sense.
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Ben Mazin 13 Dec 16
Replying to @Astro_Wright
If I'm building a Dyson Sphere/Swarm, I suddenly go from a hard to find planet to quite easy to detect from across the galaxy.
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Ben Mazin 13 Dec 16
Replying to @Astro_Wright
Maybe I don't want all the neighbors showing up to introduce themselves and borrow a cup of sugar?
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Ben Mazin 13 Dec 16
Replying to @Astro_Wright
I might just decide to cool the outside of the Sphere to 2.7K, and just be a hole in space. Dump entropy into lunar mass BH.
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Ben Mazin 13 Dec 16
Replying to @Astro_Wright
Is this true if you have a perfect IR reflective material? Make a long reflective chimney off radiator and it still sees 2 pi
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Jason Wright 13 Dec 16
Replying to @ben_amazin
Yes, if the Galaxy is a hostile place, one might hide. Not sure how one would know such a thing in advance, though.
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Ben Mazin 13 Dec 16
Replying to @Astro_Wright
Probably can do interstellar travel (maybe slowly) before you think about disassembling your solar system into a Dsphere?
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Jason Wright 13 Dec 16
Replying to @ben_amazin
Don't understand; if it's coming out over 2pi it's isotropic. If not, it's inefficient. Pipes/chimneys don't change anything.
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Ben Mazin 13 Dec 16
Replying to @Astro_Wright
You're right - output of long super chimney would come out isotropic, just moved away from radiator position.
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Ben Mazin 13 Dec 16
Replying to @Astro_Wright
Wonder if you can use some meta-material reflector that changes output angle of light based on incoming angle to break that.
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Jason Wright 13 Dec 16
Replying to @ben_amazin
I don't think so. It's the properties of the waste heat photons far away that matters. They have to have high entropy/isotropy.
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