[ExI] Tabby's star

[John Clark]

On Tue, Dec 13, 2016 at 6:37 PM, Stuart LaForge <avant at sollegro.com> wrote:


> ​> ​
> an
> ​
> absense of evidence is NOT evidence of absense.


​I think ​
Carl Sagan
​ was great and it is catchy but that really wasn't one of his better
quotes.​



> ​> ​
> Have we been looking for visible light or shorter wavelength signals from
> the star?


​O​
f course
​,​
and they found just what the did in the radio spectrum, nothing. ​


​> ​
> If Earth can exist, then we probably live in a galactic neighborhood that
> is hospitable to life.


​There​

​is nothing special about our neighborhood, except for a few hundred light
years at its very center most of the Galaxy would be as hospitable to life
as it is around here.


> ​> ​
> This makes it more likely that aliens would be
> ​
> "close".


Forger the Galaxy, if there is only one technological civilization ​in the
entire Universe you can be certain that one civilization is very very close
to you right now.



> Also we only observe one technogical civilization. That makes it
> more likely that there are only two such civilizations rather than
> "millions".
>

​We only observed 145,000 stars out of 100,000,000,000 in the Galaxy!​

​> ​
> We have observed the star dimming overall by 20% in the last century, but
> it is 1277 LY away. Which means that if it is a civilization, we are
> watching its history and not its present. For all we know, it may have
> already spread to nearby stars and we would not know it for over a
> millenium.
>

​1277 years is nothing, the Universe is 13,800,000,000 years old. And what
about the hundreds of billion of other galaxies we can observe? We know
that the Tabby's star ETs like energy a lot because they went to a lot of
trouble to capture some, but if energy is so valuable why do the ETs in
other Galaxies let all the energy from billions of suns in their Galaxy
radiate uselessly into empty space?

If ET existed the night shy should look very different from what we see,
there should be a Dyson Sphere around every star; no sun should emit
visible light, or ultraviolet, or X ray or gamma rays; suns should only
emit microwaves and maybe a little far infrared. But that's not what we
see. So why doesn't the universe, or at least the galaxy, look like its
been engineered?  Either ET does not exist or he does but he's a lotus
eater. And a lotus eater wouldn't build something around Tabby's star.

 John K Clark
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