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New Drake Equation To Quantify Habitability?

Date:
September 21, 2009
Source:
Europlanet Media Centre
Summary:
Researchers are laying the groundwork for a new equation that could mathematically quantify a habitat's potential for hosting life, in a similar way to how the Drake equation estimates the number of intelligent extraterrestrial civilizations in the Milky Way.
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Researchers from the Open University are laying the groundwork for a new equation that could mathematically quantify a habitat’s potential for hosting life, in a similar way to how the Drake equation estimates the number of intelligent extraterrestrial civilizations in the Milky Way.

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Dr Axel Hagermann will be proposing a method to find this ‘habitability index’ at the European Planetary Science Congress in Potsdam, Germany on Thursday 17 September.

“At present, there is no easy way of directly comparing the suitability of different environments as a habitat for life. The classical definition of a habitable environment is one that has the presence of a solvent, for example water, availability of the raw materials for life, clement conditions and some kind of energy source, so we tend to define a place as ‘habitable’ if it falls into the area where these criteria overlap on a Venn diagram. This is fine for specific instances, but it gives us no quantifiable way of comparing exactly how habitable one environment is in comparison with another, which I think is very important,” said Dr Hagermann, who originates from Recklinghausen in Germany.

Dr Hagermann and colleague Prof Charles Cockell have the ambitious aim of developing a single, normalised indicator of habitability, mathematically describing all the variables of each of the four habitability criteria. Initially, they are focusing on describing all the qualities of an energy source that may help or hinder the development of life.

“Electromagnetic radiation may seem simple to quantify in terms of wavelengths and joules, but there are many things to consider in terms of habitability. For instance, while visible and infrared wavelengths are important for life and processes such as photosynthesis, ultraviolet and X-rays are harmful. If you can imagine a planet with a thin atmosphere that lets through some of this harmful radiation, there must be a certain depth in the soil where the ‘bad’ radiation has been absorbed but the ‘good’ radiation can penetrate. We are looking to be able to define this optimal habitable region in a way that we can say that it is ‘as habitable’ or ‘less habitable’ than a desert in Morocco, for example,” said Dr Hagermann.

The pair will be presenting their initial study and asking for feedback from colleagues at the European Planetary Science Congress.

“There may be good reasons why such a habitability index is not going to work and, with so many variables to consider, it is not going to be an easy task to develop. However, this kind of index has the potential to be an invaluable tool as we begin to understand more about the conditions needed for life to evolve and we find more locations in our Solar System and beyond that might be habitable,” said Dr Hagermann.

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Materials provided by Europlanet Media Centre. Note: Content may be edited for style and length.


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Europlanet Media Centre. "New Drake Equation To Quantify Habitability?." ScienceDaily. ScienceDaily, 21 September 2009. <www.sciencedaily.com/releases/2009/09/090916223915.htm>.
Europlanet Media Centre. (2009, September 21). New Drake Equation To Quantify Habitability?. ScienceDaily. Retrieved December 3, 2022 from www.sciencedaily.com/releases/2009/09/090916223915.htm
Europlanet Media Centre. "New Drake Equation To Quantify Habitability?." ScienceDaily. www.sciencedaily.com/releases/2009/09/090916223915.htm (accessed December 3, 2022).

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