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Originally posted by LightAssassin
reply to post by denver22
Regarding the isotope ratio, it seems more evidence of off-world activity. You seem to be confirming my beliefs, not debunking them.
The Drake equation states that:
N = the number of civilizations in our galaxy with which communication might be possible;
R* = the average rate of star formation per year in our galaxy
fp = the fraction of those stars that have planets
ne = the average number of planets that can potentially support life per star that has planets
fℓ = the fraction of the above that actually go on to develop life at some point
fi = the fraction of the above that actually go on to develop intelligent life
fc = the fraction of civilizations that develop a technology that releases detectable signs of their existence into space
L = the length of time for which such civilizations release detectable signals into space
One can question why the number of civilizations should be proportional to the star formation rate, though this makes technical sense. (The product of all the factors except L tells how many new communicating civilizations are born each year. Then you multiply by the lifetime to get the expected number. For example, if an average of 0.01 new civilizations are born each year, and they each last 500 years on the average, then on the average 5 will exist at any time.) The original Drake Equation can be extended to a more realistic model, where the equation uses not the number of stars that are forming now, but those that were forming several billion years ago. The alternate formulation, in terms of the number of stars in the galaxy, is easier to explain and understand, but implicitly assumes the star formation rate is constant over the life of the galaxy.
The number of stars in the galaxy now, N*, is related to the star formation rate R* by
where Tg = the age of the galaxy. Assuming for simplicity that R* is constant, then and the Drake equation can be rewritten into an alternate form phrased in terms of the more easily observable value, N*.
Pretty good post i like it.
Originally posted by anon72
I love the responses... Keep it up.
I see a bit of discussion on UFO's and what constitutes a UFO.
I could not find the thread where I had brought this topic up but I will try to summarize.
At what point do we as a human race or large group say it is a true UFO? If someone knows what it is but isn't saying (a spy vehicle, drone, secret thinger...)
Someone could release a spy drone over an area and a 1000 people might spot it (a poorly designed spybot!) and they are all scared and/or amazed etc.
But the person or group who made/launched that vehicle know what it is... So...
The the one group runs around saying UFO and the other saying Nope... .. a UFO.
Originally posted by randyvs
Man are you people gonna to be let down when you see the hokey crap involved with this one.
Unbelievably asinine. Not to mention the nerd ball bone heads it employs.edit on 29-6-2012 by randyvs because: (no reason given)