ALIEN ANSWER
Researchers from the University of California believe it is possible that we could get an alien response to signals from Earth as early as 2029. While signals deliberately sent from Earth to other planets, such as the 1974 Arecibo signal, are still only a fraction of their way to their intended destination, since 1972 NASA has been using a system of radio antennæ called the Deep Space Network (DSN) to track their spacecraft and send them powerful radio signals. These include the probes Voyager One and Two, Pioneer 10 and 11 and New Horizons. Researchers Howard Isaacson and Reilly Derrick mapped out the paths of these craft, then worked out which stars could have received radio signalsthey have no evidence that the stars have planets around them or whether, if they do, they are remotely habitable; but they did the work to highlight potentially how quickly aliens could detect us and make contact given the right conditions.
