Originally posted by Dave Lenton:
Given the huge size of the universe, I suspect that we'll never actually meet any extra-terrestrial intelligent species.
True. We have been emitting radio signals for 50 years. And the radio signals transmitted so far, are powerful enough to travel for only 50 years. The problem is, this will cover only fraction of milky way area,let alone andromeda(nearest galaxy).
About existance of life, scientists are alreday finding life on earth in extremely improbable places, like in deep sea near Indonesia where the water temprature is more than 80 degree Celcius, highly contaminated toxic water and water pressure "enough to reduce human body to pulp.
Other places they found life was deep inside caves where no sunlight ever passes and no water is available. That life is not necessarily intelligent with its own defence system .
The question is, if life can exist and even flourish in unlikely circumstances here, why not on the other planets ?
The fundamental belief, that life can exist in a very narrow range of situations, is proving wrong.