Even the most sophisticated radio arrays have not yet detected any signals that could have possibly been beamed through space by aliens. Maybe aliens have no interest in phoning Earth, and would rather transmit message to their own probes orbiting nearby planets. Whether aliens have any desire to explore space like we do is unknown. DSN transmissions have peaked at certain times during Earth’s orbit—especially conjunctions between Earth and the Sun. Aliens using the same strategy might experience a peak in transmissions during their own planet’s conjunctions with their star.