Drake equation, Physics

Drake equation (F. Drake; 1961)

A technique of estimating the number of intelligent, technological species (that means, able to communicate along with other species) in existence in our Galaxy.

N = R fp ne fl fi ft L.

N refers to the number of species defined above at any given moment in our Galaxy. The parameters it is calculated from are as follows:

R is the rate of star formation in our Galaxy (in stars per year);

Fp is referring to the fraction of stars which have planets;

neis refer to the number of habitable planets per system with planets;

flis refer to the fraction of habitable planets on which life arises;

fi is refer to the fraction of these planets on which life develops intelligence;

ft refer to the fraction of these planets where the intelligence develops in a technological civilization able of communication; and

L refers to the mean lifetime of such a technological civilization.

Of these quantities, just the first R is known to anything like any reliability; this is on the order of 10 stars per year. The others, most particularly the fractions, are almost completely pure speculation at this point. Calculations made through respectable astronomers differ by something such as ten orders of magnitude in the ultimate estimation of the number of species out there.

Posted Date: 3/28/2013 2:28:29 AM | Location : United States







Related Discussions:- Drake equation, Assignment Help, Ask Question on Drake equation, Get Answer, Expert's Help, Drake equation Discussions

Write discussion on Drake equation
Your posts are moderated
Related Questions
explain the formation of energy band in intrinsic semiconductor

Explain displacement x(t) is known as displacement and it denotes the position of a body at time. If the displacement is positive then that body is to the right of the chosen

I really just need an interview with someone (it''s a total of nine questions). I have had trouble getting responses and I''m getting desperate about making my deadline. I will als

What is the importance of vector quantities in real life? Cite some applications.

Charge and discharge characteristics of nickel cadmium cell: During charging and discharging the electrolyte acts only as an ionised conductor, transporting electrons from one

An object with a mass of 5 kilograms is a distance of 5 meters above the surface of the earth.  If the acceleration because of gravity is 10 meters per second squared, the pote


(i) Effect of temperature: (a) In general elasticity reduces as the temperature increases. (b) Invar is an exception. There is no effect of temperature on elasticity of in

Can you explain that a wave through the origin always has a slope of one or not?

what is cmos