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Originally Posted by kcirick
Organisms as we know needs oxygen and temperatures adequate for living. Therefore, we have two main issues to think about:
1. Distance from our heat source (think about how far our Earth is from the Sun. Mercury, which is closer to the Sun has surface temperature of about 300 celsius during the day and -100 celsius at night)
2. How Earth aquired the atmosphere, which encapuslates (sp) gases needed for living organisms to breath in and out. By studying this mechanism, we can determine the possibility of this event happening. None of the stars we have observed thus far has this property.
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That is true. BUT, also consider that life does not revolve around oxygen. There are certain species of fungi that have been found to be able to survive without oxygen and sunlight. Also consider that just because the tempeture is just right for us does not mean that other organisms in outer space can't survive in a different range of tempeture. Maybe on our planet they would be freezing cold for them, just wanted to point out a few things. =)