Abstract
This article is intended to provide a review of some modifications to the Drake equation, a 1961 concept presented by Frank Drake to determine the number of extra-terrestrial civilizations able to communicate. A reduced version of the Drake equation will then be presented. This can be used to estimate an important question for astrobiology, the frequency with which planets are habitable. Finally, a concept is presented that can also integrate the habitability of moons into the reduced Drake equation.
Highlights
This article is intended to provide a review of some modifications to the Drake equation, a 1961 concept presented by Frank Drake to determine the number of extra-terrestrial civilizations able to communicate
The variable f l indicates the fraction of planets in the habitable zone where life arises, and f i refers to the proportion of such life forms that can be described as intelligent
Space Institute published a new version of the Drake equation [6]
Summary
In 1959, astronomers Giuseppe Cocconi and Philip Morrisson came up with the idea that the current measuring instruments could be used to receive signals from civilizations that have formed outside our solar system. These signals should be transmitted with the wavelength of neutral hydrogen 1.42 MHz due to the universal importance of this element [1]. Drake was unable to detect any such signals For his conference at the Green Bank Facility in 1961, he developed a conception, essentially the conference agenda, that would lead to an estimation of the appropriate kind. Way that send detectable signals into space [3]
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