> Powerful telescopes that will soon be operational may be capable of detecting city lights on the night side of planets that orbit distant stars or the telltal

> Powerful telescopes that will soon be operational may be capable of detecting city lights on the night side of planets that orbit distant stars or the telltale mark of reflected light from planet-wide solar-collecting arrays or the distinctive sign of industrial chemicals in a planet’s atmosphere. All of these “technosignatures,” should we find evidence of them, will be small effects. If we do detect such things, you better believe that my colleagues and I will go to extraordinary lengths to eliminate every possible source of error and every possible alternative explanation. That is nuts, and incredibly exciting!