Whats the purpose in life? I often think about this a lot. This is totally subjective (so is everything else in life) and I think if you strip it back to basics most things have evolved to become immortal. We are only born to make humans immortal.
This then made me think about this question, have we evolved brains and become intellectuals to find away to leave earth to keep humans from becoming extinct from a distaster in the not to distant future ?