Abstract
Are we alone? Humans have been asking this question throughout history. We want to know whether there is life beyond the Earth and whether any of it is intelligent. Since the middle of the twentieth century we have had tools that permit us to embark on a scientific exploration to try to answer this old question. We have discovered extremophiles in the most unexpected places on this planet and we have discovered that there really are far more planets than stars out there. We haven’t yet found life beyond Earth, but there is a vast amount of potentially-habitable real estate to explore. As we look up and look out, we are forced to see ourselves from a cosmic perspective; a perspective that shows us as all the same, all Earthlings. This perspective is fundamental to finding a way to sustain life on Earth for the long future.
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