For six decades, SETI has attempted to prove the existence of technologically advanced intelligence by detecting artificially generated electromagnetic signals. While such signals could certainly exist and – given the right circumstances – might be measurable here on Earth, contemporary searches are all compromised by limited sensitivity and a reliance on persistent transmissions. The energy required for any putative transmitters, the possible wish of the senders to be cryptic, and a likely ignorance about Homo sapiens’ existence all lead to the reasonable conclusion that greater attention to artefact searches could hasten the discovery of alien intelligence. We consider both the motivation, the advantages and the disadvantages of this approach. We also enumerate some of the specific artefact strategies that have been proposed and pursued.

中文翻译：

---

SETI：人工制品搜索的论据

六年来，SETI 一直试图通过检测人工产生的电磁信号来证明技术先进智能的存在。虽然这样的信号肯定存在，而且——在适当的情况下——可能在地球上可以测量到，但当代的搜索都受到有限的灵敏度和对持续传输的依赖的影响。任何假定的发射器所需的能量，发送者可能希望是神秘的，以及可能的无知智人' 存在都导致了一个合理的结论，即更多地关注人工制品搜索可以加速外星情报的发现。我们考虑了这种方法的动机、优点和缺点。我们还列举了一些已经提出和追求的特定人工制品策略。