A new study shows what aliens within 200 light-years might see if they trained their own powerful radio telescopes on our planet. Professional outfits like the Search for Extraterrestrial Intelligence (SETI) Institute scan the skies with radio telescopes for any sign of extraterrestrial life. While that effort has produced some exciting close calls , humanity most likely has yet to find any sign of alien life. “This would look clearly artificial to anyone watching from interstellar distances with powerful radio telescopes,” Caisse Saide said in a press statement. “In fact, these military signals can appear up to a hundred times stronger from certain points in space, depending on where an observer is located.”The authors looked at this “hidden electromagnetic leakage” from the perspective of six stellar systems: Barnard star (6 light-years away), HD 48948 (55 light-years away), HD 40307 (42 light-years away), HD 216520 (64 light-years away), LHS 475 (40 light-years away), and AU Microscopii (32 light-years away).