How many Aliens - Drake description

Test yourself to find how many alien civilizations there is in our galaxy by using the Drake equation. Compare your results with your friends.

The Drake Equation determines the number of technologically advanced civilizations that might exist in our Galaxy. It was formulated in 1961 by Dr. Frank Drake and is generally accepted by the scientific community.

Change the default values (scientific acceptable values) to find out how many alien intelligent civilizations there is in our galaxy.