> "The search for intelligent life is only expected to yield a positive observation if the average life-span of [communicating extra-terrestrial intelligence] w

> "The search for intelligent life is only expected to yield a positive observation if the average life-span of [communicating extra-terrestrial intelligence] within our Galaxy is 3,060 years. That is to say, our communicating civilization here on Earth will need to persist for 6,120 years beyond the advent of long-range radio technology (approximately 100 years ago) before we can expect a [search for extra-terrestrial intelligence] two-way communication." https://edition.cnn.com/2020/06/15/world/intelligent-civilizations-galaxy-scn-trnd/index.html https://edition.cnn.com/2020/06/15/world/intelligent-civiliz...