The #Arecibo message* could be detected up to about 12,000 light-years away from the Earth which is nearly halfway to the galactic centre (the #MilkyWay π is 105,700 light-years in diameter and the #SolarSystem is 26,000 light-years from the galactic centre). However, since Arecibo message was broadcasted in 1974, it has travelled only about 50 light-years π so far https://www.scientificeuropean.co.uk/sciences/space/how-far-human-civilisation-is-detectable-in-space
* The message was aimed at #Messier13, about 25,000 light years from Earth https://en.wikipedia.org/wiki/Arecibo_message
