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
Why is the Kinetic energy of the system minimum in the frame of the center of mass for any number of particles solution) The kinetic energy of any entity depends on the reference

why is friction necessary

one coin is thrown upword from 100m top building with velocity 15m/s .2s later 2nd coin is dropped downword at what distance from top of building 2nd coin cross first? Ans) They

Explain the Elementary Particles and Particle Accelerators More than 100 particles smaller than the proton, electron and neutron have been discovered and are referred to as eleme


It is known that the pressure developed by a centrifugal pump, Δp, is a function of the diameter D of the impeller, the speed of rotation n, the discharge Q, and the fluid density

This problem examines the seasonal solar radiation budget at three geographical locations: the Equator, 40º North, and 80º North. NOTES: At a given geographical location, N

Steps of working of Unijunction Transistor (i)  When emitter circuit is closed through switch S but emitter voltage is reduced to zero, and a voltage V BB is applied between

An element exists in two solid phases (labelled P1 and P2). The standard molar entropies of P1 and P2  are 21.9 J mol -1 K -1  and  23.3 J mol -1 K -1  respectively. The

Consider a 10 cm long portion of a straight wire having a current of 10 A placed in a magnetic field of 0.1 T making an angle of 530  with the wire. What magnetic force does the wi