Search
Mobile Site Shops eMail Author Caption Comp Monthly Poll Sudden Death Colour Key Statistics Cookie Usage
Ships Fleets Weaponry Species People Timelines Calculators Photo Galleries
Stations Design Lineage Size Charts Battles Science / Tech Temporal Styling Maps / Politics
Articles Reviews Lists Recreation Search Site Guide What's New Forum

2019

October

September

August

July

June

May

April

March

February

January

2018

December

November

October

September

August

July

June

May

April

March

February

January

2017

December

November

October

September

August

July

June

May

April

March

February

January

2016

December

November

October

September

August

July

June

May

April

March

February

January

2015

December

November

October

September

August

July

June

May

April

March

February

January

2014

December

November

October

September

August

July

June

May

April

March

February

January

2013

December

November

October

September

August

July

June

May

April

March

February

January

2012

December

November

October

September

August

July

June

May

April

March

February

January

2011

December

November

October

September

August

July

June

May

April

March

February

January

2010

December

November

October

September

August

July

June

May

April

March

February

January

2009

December

November

October

September

August

July

June

May

April

March

February

January

2008

December

November

October

September

August

July

June

May

April

March

February

January

2007

December

November

October

September

August

July

June

May

April

March

February

January

2006

December

November

October

September

August

July

June

May

April

March

February

January

2005

December

November

October

September

August

July

June

May

April

March

February

January

2004

December

November

October

September

August

July

June

May

April

March

February

January

2003

December

November

October

September

August

July

June

May

April

March

February

January

2002

December

November

October

September

August

July

June

May

April

March

February

January

2001

December

November

October

September

August

July

June

May

April

March

February

January

2000

December

November

October

September

August

July

June

May

April

March

February

January

1999

December

November

October

September

August

July

June

May

April

March

February

January

1998

December

November

October

September

August

July

June

May

Drake Equation Calculator

Created by Frank Drake in 1961, the original Drake equation was designed to calculate the number of intelligent communicative species which could be expected to exist in the galaxy. To accomplish this the equation multiplied a series of terms such as the rate of star formation, the fraction of stars with planetary systems, the number of planets in each system, etc. The number of intelligent species was simply the product of all these terms. Many different versions have come to exist over the centuries since the original was created; the original equation is reproduced here.

When the original equation was created only a few of the terms were known with any significant degree of accuracy; the real value of the equation, then, lay in the debate it promoted rather than the answers it produced. As Humanity has expended into space it has become possible to gain a greater understanding of astrophysics and a sampling of the distribution of life in a statistically significant percentage of the galaxy, allowing the equation to be used with a much higher level of confidence.

Rate of star formation : per year (typical values 10-40)
Percentage of stars with planets : (typical values 20% to 50%)
Average number of planets per system :
Percentage of planets capable of supporting life :
Percentage of life capable planets that evolve life :
Percentage of life bearing planets on which intelligence evolves :
Life span on an intelligent civilisation : years
Current number of intelligent lifeforms :

Copyright Graham Kennedy Page views : 27,693 Last updated : 1 Sep 2004