Life on Earth is 3.5 billion years old. We are able to transmit and receive radio signals for barely a hundred. Aside from the issue of how we would divine if a

Life on Earth is 3.5 billion years old. We are able to transmit and receive radio signals for barely a hundred. Aside from the issue of how we would divine if an alien world contains life, even if we did pointing most of telescopes in it's direction is most certainly a waste. Chance that somebody would be transmitting when we are listening is vanishingly small.