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http://en.wikipedia.org/wiki/EarthI was listening to a recently filmed debate and the idea came across that the earth was designed; this was presented by Rabbi Shmuley Boteach. These are the things he mentions, which I have heard before, I would like to summarize them; if the earth were a little closer or further away, then the earth would freeze or boil. If the earth was not tilted then massive ice mountains would build up, drawing the water away from large parts of the world creating deserts. If the earth did not rotate at the 1000mph, rather at a slower 100mph then the days would burn everything alive and the night would freeze the same life. If the moon was a little closer then the tides would flood all the land. If the oceans where deeper it would absorb all the carbon dioxide making plant life impossible. If the atmosphere was a little thinner then meteors would fall to earth and cause vast devastation and if water did not expand when it freezes the fish in the seas would die. I agree with all of this, however, I disagree that this should be used in the case to support the idea of the Earth being designed for the life. This is not a religious debate, rather a reasoned one. The designed Earth statement means that it would be the result of a designer that knew what life required and then created the Earth for the purpose, even if the designer was nature.

What is to say that if one of these things changed that there would be no life on earth? Of course, there would be differences between the life that we know and the life that would have existed, that is a given in these new set of circumstances. The earth as we know is a perfect place for life and that life can be found almost anywhere on the planet. If we take the statement the earth is designed for life, let’s put that into a deductive model so we can see what we have:

The Earth was designed for Life.
Only Earth (or Earth like planets) has the ability to support life.
Life can only exist on the Earth or Earth like planets.

All we need is to find life that does not exist on earth, to show that environments unlike Earth’s can support living things and from that we can take the earth was not designed for life, since other places that are not like the earth has life on them. As soon as life not from earth exists then we either have to reject the idea of a designed earth or we have to consider that other planets or places in the universe are also designed. It just happens that the ‘unique’ set of circumstances makes the earth a successful place for life , being successful is different from the notion of a designed earth. Carolyn Porco discusses the idea that one of Saturn’s moons Enceladus has the three building blocks of creation; liquid water, organic materials and heat. This was discovered via the last probe that went passed the moon and in theory it is possible that life on Enceladus is completely achievable. This moon has the right environment for the life as we know it to exist. If it is later discovered that there is life on Enceladus, which would most likely be in the form of micro organisms, then that would prove false the statement the Earth is designed for life and we would have to rethink the statement to produce something like the earth and other places are designed for life. Or it would be equally likely that the statement some places in the universe have a greater likelihood of life depending on certain factors, would be an acceptable replacement. This is not design but rather chance and a certain possibility considering the size of the galaxy.

It is interesting that if life on Enceladus is found, where would this leave the idea of evolution as a scientific theory? I think that it would support the idea strongly, once we have removed the idea of the Earth being designed for life we are left with the notion that life is designed for the earth, even if we assume that the Earth is such a great place for life, then nothing better than evolution explains both this life in two places in our solar system.

I cannot wait until the next mission to Enceladus!

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