As you can tell the name of the blog is Drake Equation. If you are not familiar with the equation it basically goes something like this although I am not a Mathematician (my Father is). If the universe in infinitely big.. the odds of their not being life somewhere else is infinitely small. Or as Wikipedia says “The Drake equation is a mathematical equation used to estimate the number of detectable extraterrestrial civilizations in the Milky Way galaxy. It is used in the field of the Search for ExtraTerrestrial Intelligence (SETI). The equation was devised in 1961 by Frank Drake while at the National Astronomy and Ionosphere Center.”
The main link in this post has to do with the exo planets they have located in the past few years. They have found plenty of Earth like planets the problem is there is something slightly wrong with each one they have found. Astronomers now believe they will find an exact enough replica of Earth this next year that would be able to sustain life.