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
Organic & polymer solar cells are made from thin films (typically 100nm) of organic semiconductor such as polymer and small molecule compounds like poly phenylene vinylene, copper

why the least distance of distinct vision is 25 %

what is the force of friction on a 5 kg box slides on a horizontal plane when its speed decreases 1.5ms-1 in a second?

The greatest and least magnitude of the resultant of two forces of constant magnitude are P & Q. Proof that when the forces act at an angle of 2 alpha, their resultant is of magnit

Consider a horizontal cylinder with diameter D and length L. The center of the cylinder is a distance a above the ground. A wall with length W and height H is located to the side o

Draw a picture of a moving source and the waves surrounding it according to what you observed in this experiment. How does the spacing of the wavefronts in front of the source comp

A beaker of water sits in the sun until it reaches an equilibrium temperature of 30°C. The beaker is made of 100 g of aluminum and contains 170 g of water. In an attempt to cool th

Figure  shows the magnetic circuit of a relay. When each of the air gaps are 1.5mm wide find the mmf required to produce a flux density of 0.75 T in the air gaps. Use the B-

Evaluate the volume of the bubble A diver releases an air bubble of volume 2.7cm 3  from a depth of 17 below the surface of a lake, where the temperature is 8.0°C. What is the v

(1) These rays transmitted in the forward direction of medium with a finite speed. (2) Energy and momentum are transmitted in the direction of propagation of waves without real