Astronomy
The Search for Technosignatures in Radio and Optical Wavelengths
Quick fact
Despite more than 60 years of searching, we have scanned less than 0.00001% of the 'cosmic haystack'—the vast space of possible frequencies, directions, and times—and yet we have found no confirmed technosignature.
Why this is interesting
We are not just looking for alien life; we are listening for their machines. Have we actually heard anything, or is the silence itself a clue?