Assuming we do detect a planet that has all the characteristics described by Dr. Sasselov (rocky but watery, slightly larger than the earth, in the Goldilocks zone), how do you think we should follow up to definitely prove that it contains life? Do you think we will ever be able to say with certainty that there is life on a distant planet from thousands of light years away? Would you ever be convinced by data that was entirely collected from afar? Explain your answer.
It’s hard to say that there surely is life in planet far away from earth. We cannot take samples, and if many light years away, there is that time difference too. If planet which we are studying is say thousand light years away, it takes thousand years to light to travel from there to reach us.