# Drake equation applied dating

If you read my Huffington Post blog article on Habitable Zones you know that this zone is that not too hot not to cold region around any star where a planet could support liquid water and could manage to hold onto an atmosphere.

These days the Drake Equation two particular versions of the re-imagined Drake equation take front and center and produce different results between them. One version linked below appears in Astrobiology magazine, and discusses the Drake equation from two separate trains of thought: The Classical Drake equation and the Statistical Drake equation.In our current Exoplanet count we puts the total number of Exoplanets somewhat north of 3300. Originally the planet hunting results were more limited, providing us with the ability to find only the biggest Jupiter sized planets.But as techniques were honed to a finer art, we started to find smaller more Earth sized planets.Super-Earth implies Earth -like I know but the term doesnt distinguish between planets that are habitable or not.It just says that if its between 1 and 10 times Earth's mass, its a Super-Earth.So with only one known life-bearing planet at the time, ours, the calculation of the ultimate value for the Drake Equation was always a conservative guess based on comparison to the progress of human civilization and the technologic precipices we faced.

Naturally we dont yet know of any advanced civilization. We represent a single data point and only one such point is not sufficient to create a trend or an understanding.

Such a planet could be a massive paradise, a seething maelstrom of gases, or an airless rock.

The ability to find such planets however represents a significant improvement in planet detection capability.

The classical equation looks like this where all the factors are multiplied together: N = R x fp x ne x fl x fi x fc x L The factors break down as: N = number of alien civilizations in the Milky Way R = number of stars in our galaxy fp = Fraction of stars with planets ne = number of planets that where life as we know it can exist fl = % of those planets where life arises fi = % of those planets (fl) where intelligence develops fc = % of those societies that develop electromagnetic science f L = % of societies that emit electromagnetically into space for a long time The Drake equation actually required guesses for many important factors.

It also provided the means to quantify with a value the number of potential civilizations that emitted some form of intelligent signals that could be picked up by our current technology at the time.

Such a restriction removes a number of hotter more energetic stars from our hunting list because the radiation and strong stellar winds emanating from those particular stars would likely have blown the atmospheres off the planets or irradiated their surfaces to sterility.