On Friday, March 2, 2018 at 12:03:33 PM UTC-6, John Clark wrote:
> On  <agrays...@gmail.com <javascript:>> wrote:
>>>>> ​>
>>>>> ​>>​
>>>>> * ​*
>>>>> *"A Statistical Analysis of the Martian Wave of Darkening and Related 
>>>>> Phenomena",  Planetary and Space** Science , 15, (1967) 817-24. *
>>>> ​>> ​
>>>> ​*So you must be either ​*
>>>> *James B.Pollack​ ​or Edward H.Greenberg​. But... I thought your name 
>>>> was Alan Grayson​.​*
>>> *​> ​You thought.​ ​Is that what you do?*
> Yep,
> ​ ​
> thinking is what I do.
> * ​> ​Let me help. Pollack died in 1994 of cancer of the spin.*
> ​
> So one of two things must be true:
> 1)
> ​ ​
> You are
> ​ ​
> Edward H.Greenberg
> ​ ​
> and for some inscrutable changed your name to
> ​ ​
> Alan Grayson.
> 2) You are as phony as a three dollar bill and never wrote a paper with 
> Carl Sagan
> ​, much less 2​
> .
>> ​> ​
>> I worked with him 
>> ​[Sagan] ​
>> directly for 18 months. He didn't regard me as a crackpot.
> I can say with great confidence that if Sagan knew you at all (a big if) 
> and if you took the
> ​ ​
> Roswell
> ​ ​
> idiocy as seriously then as you do now then he did regard you as a 
> crackpot, although Sagan was always very polite and had more
> ​ ​
> patience with fools than I do.
> ​  John K Clark​

I saw Sagan at a conference, where he was a celebrity and I was just a grad 
student grunt. He was a lot older than I was, and anyone claiming to have 
worked with him is proclaiming their senior citizen status.

I looked up in Wikipedia on Sagan to look at papers he published. I ran 
into this little quote

Sagan's Paradox

Sagan's contribution to the 1969 symposium was an attack on the belief that 
UFOs are piloted by extraterrestrial beings: Applying several logical 
assumptions (see Drake equation 
<https://en.wikipedia.org/wiki/Drake_equation>), Sagan calculated the 
possible number of advanced civilizations capable of interstellar travel to 
be about one million. He projected that any civilization wishing to check 
on all the others on a regular basis of, say, once a year would have to 
launch 10,000 spacecraft annually. Not only does that seem like an 
unreasonable number of launchings, but it would take all the material in 
one percent of the universe's stars to produce all the spaceships needed 
for all the civilizations to seek each other out.

To argue that the earth was being chosen for regular visitations, Sagan 
said, one would have to assume that the planet is somehow unique. And that 
assumption "goes exactly against the idea that there are lots of 
civilizations around. Because if there are then our sort of civilization 
must be pretty common. And if we're not pretty common then there aren't 
going to be many civilizations advanced enough to send visitors."

which is sort of interesting. Chock up another of these "paradoxes" that 
point to the rarity or paucity of ETs out there.


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