Are we alone in space? Well, that is the eternal question. Thanks to Drake's equation, we can predict the odds of meeting another intelligent civilization. But first, we need to know all about this equation. Are you ready to ace this quiz?
The number of starts in the Milky Way
The number of planets in the Milky Way
The number of of active, communicative extraterrestrial civilizations in the Milky Way
The number of galaxies similar to Milky Way
Dr John Drake
Dr Drake Francis
Dr Frank Drake
Dr James Drake
The average rate of star formations in our galaxy
The approximate number of stars in our galaxy
The number of uninhabited planted
The fraction of planets bearing life on which intelligent, civilized life, has developed
L = R* • fp • ne • fl • fi • fc •N
N = R* • fp • ne • fl
N = R* • fp • ne • fl • fi • fc
N = R* • fp • ne • fl • fi • fc • L
The number of stars is a constantly changing number.
The number of life-suitable planets is always changing.
The scientists have no firm numbers of any variable.
The signals civilizations release into the space isn't detectable.
Fi
Fp
Fc
L
The length of time for which civilizations release detectable signals into space
The fraction of life bearing planets on which intelligent life emerges
The fraction of those stars with planetary systems
The rate of formation of stars suitable for the development of intelligent life
Alexander Zaitsev
Harlow Shapley
Astronomer Sara Seager
Dr Drake himself
It's an equation that calculates how many times intelligent civilizations have tried to contact us
It's an equation that predicts the number of potential extraterrestrial contacts
It's an equation that calculates the odds of finding intelligent life in the universe.
It's an equation that calculates the exact number of intelligent civilizations in the universe
A probabilistic argument
A model theory
An axiom
A theorem