Often, we are tempted to believe that unexplained astronomical phenomena are the work of intelligent aliens. And just as often, there are scientific, albeit unexpected explanations. More recently, the search for extraterrestrial intelligence (SETI) has been looking for alien-made signs in the universe.
"NASA recently awarded a grant to a SETI project that will seek out signs of alien “technosignatures,” such as solar panel arrays on distant exoplanets. Breakthrough Listen, the largest SETI initiative to date, is thinking even bigger, searching for sophisticated engineering projects that span entire star systems or even galaxies"
