Earth's most detectable technosignature with present-day instruments is planetary radar, visible to 12,000 light-years, while most other signatures fade within a few light-years.
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Earth Detecting Earth: At what distance could Earth's constellation of technosignatures be detected with present-day technology?
Earth's most detectable technosignature with present-day instruments is planetary radar, visible to 12,000 light-years, while most other signatures fade within a few light-years.