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Scientists revise scale for weighing E.T. contact

Image: Jill Tarter
SETI pioneer Jill Tarter pays a visit to the Allen Telescope Array in California, one of the prime sites for the search for extraterrestrial intelligence. (Credit: SETI Institute)

For almost 60 years, efforts to pick up signs of extraterrestrial civilizations have yielded a big fat zero, but there have been plenty of false alarms to contend with.

To provide a reality check, the International Academy of Astronautics adopted a 1-to-10 rating system for claims of contact, known as the Rio scale, back in the early 2000s. Now a group of astronomers is proposing a “Rio 2.0” scale that brings the reality check up to date.

Get the full story on GeekWire.

By Alan Boyle

Mastermind of Cosmic Log, contributing editor at GeekWire, author of "The Case for Pluto: How a Little Planet Made a Big Difference," president of the Council for the Advancement of Science Writing. Check out "About Alan Boyle" for more fun facts.

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