heres another interesting thing to think about, humans are a carbon based life form, what if there was life forms on other planets with a different chemical base? a whole different chain of evolution! hold that thought for a sec, scientist usually look for life in places that will support us, different creatures here on earth survive in different climates and its impossible for them to survive in others, for example penguins cant survive in the dessert. so why shouldn't it be like that up in the cosmos?
now combine the two ideas, what if there is life on an environmentally hostile planet, and has a different chemical base? what if there is a form of life living within our sun? we just deem it impossible because we wouldn't survive there. but look at it in another sense; if they were to look at the suns surounding planets searching for life they would probably deem it impossible saying "its too cold for our species to live there, there is no life". =] welcome to my imagination.