Is there life beyond Earth?

From the ancient Greek philosophers who theorised about it to modern-day astrobiologists using robust scientific techniques to answer it, the question of whether life exists beyond Earth has captured the human imagination for centuries. So far, we’ve not had much luck. But today scientists are more confident than ever that we’ll discover some sign of life in our corner of the galaxy in the next decade. So how exactly do we look for extraterrestrial life, and might we really find it?