## September 6, 2007

### I want to believe…

This question inspired by a suggestion from Prabhu

Identify this equation:

And without further ado, clues:

.

Lots of jobless people, namely Arun Krishnamoorthy , Anuj , BiGFooT , bs , Swetha , Vinod , Ganesh Prasad , nihit , Preetish , Tathagata Chatterjee , jayanth , ram , Gammafunction , Shashank , Abhishek , alephnull , prasanth , yaksha , Mahesh Herle , pratap , Prasad , and udupendra , took the time to point out that:

This is the Drake Equation.

Some more people went on to identify that

(1) is the WOW! signal, and (2) is the Arecibo message, considered very likely to be our first interplanetary I/O operations (respectively) :-)

I believe this is the Drake Equation…

N is the number of civilizations within our galaxy that emit radio and other waves that we would be able to detect. R is the rate for the formation of stars that would be able to sustain planets with life. Fp is the fraction of such stars that have planets orbiting them. Ne is the number of planets in each solar system that would be able to support life, orbiting in their star’s habitable zone. Fl is the fraction of planets capable of sustaining life that actually do develop life. Fi is the portion of life-bearing planets on which intelligence develops. Fc is that fraction of planets with intelligent life that develop civilizations whose emissions we can detect with current or future technology. Finally, L is the length of time that signals are emitted by each alien civilization, respectively. Another way of describing the function of L is saying that it represents how long a civilization lasts.

The Drake Equation.

I was almost sure I heard absurd signals while tuning my radio, only to realize it was a solo vocal act by the nasal god himself.

The truth is out there :)

Thats the Drake Equation , which is ” used to calculate the number of civilizations in our galaxy with which we might hope to be able to communicate” .

Too drowsy to track down pic 1 but the 2nd pic depicts the Arecibo message,which was bascially a radio pulse transmitted towards a star cluster with info about the digits,DNA structure etc…

Drake equation

The Drake Equation, developed by astronomer Frank Drake in 1961. It is a scientific formula to calculate the number of technological civilizations that might exist in the universe.

The formula is expressed as

[ N = R* x fp x ne x fl x fi x fc x L ]

N = The number of communicative civilizations

R* = The rate of formation of suitable stars

fp = The fraction of those stars with planets

ne = The number of Earthlike worlds per planetary system

fl = The fraction of those planets where life develops

fi = The fraction of life-bearing worlds on which intelligence develops

fc = The fraction of planets on which technology is developed

L = The “Lifetime” of communicating civilizations

The Drake Equation, created by Frank Drake for ET Life Research.

Drake Equation

N = The number of civilizations in The Milky Way Galaxy whose electromagnetic emissions are detectable.

R* =The rate of formation of stars suitable for the development of intelligent life.

fp = The fraction of those stars with planetary systems.

ne = The number of planets, per solar system, with an environment suitable for life.

fl = The fraction of suitable planets on which life actually appears.

fi = The fraction of life bearing planets on which intelligent life emerges.

fc = The fraction of civilizations that develop a technology that releases detectable signs of their existence into space.

L = The length of time such civilizations release detectable signals into space

Drake’s Equation estimates the number of civilizations in our galaxy which might be capable of interstellar radio communication.

The Drake Equation

This is the Drake Equation. N stands for the nos of extraterrestrial civilisations which can be found in our galaxy.

Regards,

Tathagata Chatterjee

PS : Clues relate to Permi’s paradox and SETI ?

Drake equation.. estimates the number of extraterrestrial civilizations in our galaxy with which we might come in contact… or something like tat.

Drake’s equation :

N = R*× fp × ne × fl × fi × fc × L

where:

N is the number of civilizations in our galaxy, with which we might hope to be able to communicate;

R* is the rate of star formation in our galaxy

fp is the fraction of those stars that have planets

ne is the average number of planets that can potentially support life per star that has planets

fl is the fraction of the above that actually go on to develop life at some point

fi is the fraction of the above that actually go on to develop intelligent life

fc is the fraction of civilizations that develop a technology that releases detectable signs of their existence into space

L is the length of time such civilizations release detectable signals into space.

In 1960 Dr. Frank Drake became the first person to systematically listen for alien communication in a project called Ozma, which was named after a Frank Baum book in the Oz series. Using the twenty-five-meter dish of the National Radio Astronomy

Observatory in West Virginia, Dr. Drake listened to two stars, Epsilon Eridani and Tau Ceti, April to July 1960. Though unsuccessful, his subsequent equation N=RxfpxnexflxfixfcxL launched a culture, market, and scientifically tangible search for aliens. Drake’s innovation was to to shift the focus from speculations on galactic requirements for life to mathematical formulas.

“I came across the strangest signal I had ever seen, and I immediately scribbled ‘Wow!’ next to it,” explained Jerry Ehman, scientist for the SETI (Search for Extraterrestrial Intelligence) project at the Big Ear Radio Observatory at Ohio State in 1977.

The Drake equation!-which quantifies the probability of life existing elsewhere

Drake Equation

The first pic is the “Wow! signal”

second – Some ancient game ;)

1.Drake equation – This equation was devised by Dr Frank Drake (now Professor Emeritus of Astronomy and Astrophysics at the University of California, Santa Cruz) in 1960, in an attempt to estimate the number of extraterrestrial civilizations in our galaxy with which we might come in contact. The main purpose of the equation is to allow scientists to quantify the uncertainty of the factors which determine the number of such extraterrestrial civilizations.

2.The Wow! signal was a strong, narrowband radio signal detected by Dr. Jerry R. Ehman on August 15, 1977 while working on a SETI project at the Big Ear radio telescope of Ohio State University.

1. The Fermi equation to estimate the number of extra-terrestrial civilisations.

2. The WOW signal from 1977

3. The image that is recorded on the gold plates on Voyager (designed by Carl Sagan) ?

The Drake Equation a.k.a The Sagan equation a.k.a the green bank equation

1) Image of the WOW! signal

2) A graphical representation of the Arecibo message – Humanity’s first attempt to use radio waves to communicate its existence to alien civilizations

Drake’s equation

the explanation is here

http://library.thinkquest.org/.....e=origin09

Drake Equation. which “attempts to evaluate the number, N, of civilisations with whom we might communicate as a function of a number of factors.”

Drake Equation

That would be Drake’s equation, used to estimate the no of intelligent extraterrestrial civilization could come into contact with.

Clue 1 is the Wow signal, outcome of a SETI signal analysis.

Clue 2 seems to be some dude standing on what seems to be the Gmail logo wondering that he’s doing standing on top of the GMail logo.

Drake Equation

Perhaps an equation that gives the probability of existence of intelligence outside the earth.