deletions | additions       diff --git a/With_an_estimated_diameter_of__.tex b/With_an_estimated_diameter_of__.tex  index b541a4d..81daa2f 100644  --- a/With_an_estimated_diameter_of__.tex  +++ b/With_an_estimated_diameter_of__.tex 
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With an estimated diameter of 93 billions light years and an age of 13.7 billions years, our Universe is an astonishingly big place and it's been around for a very long time. When you look up the sky  you only get a short glimpse at a tiny fraction of the billions of stars and the with their  billions of worlds that populate the cosmos, but that's enough to make us wonder: "Are we alone?" In the \href{https://www.authorea.com/users/2/articles/24715/_show_article}{previous post} we discussed the likelihood of the emergence of (intelligent) extraterrestrial life. Starting from the famous Drake Equation and using the most recent findings in astrophysics and some astrobiology arguments, we obtained a simple way to estimate the number of communicative civilizations in our Galaxy. This turns out to be the product of the chance of emergence of intelligent life $f_i$ and the average lifetime $L$ of a civilization's communicative phase.   \begin{quote}