October 2, 2000🇧🇷Sighting
Close Encounter
Rio de Janeiro: Rio Scale proposed for ET contact
Astronomers Iván Almár and Jill Tarter introduced the Rio Scale at a SETI meeting in Rio de Janeiro to measure the significance of potential extraterrestrial detections on a 0-10 scale. It assesses societal impact and was later updated to cover messages and artifacts.