Scientists discuss early history of attempts to contact extraterrestrial intelligence
A scientific editor and chief editor outline the origins of METI and the long-standing search for signals from other civilizations.
Ancient observations and modern silence
Humans have looked at the stars since ancient times to find signs of life. Despite this long history, no evidence of extraterrestrial life has been found. This lack of detection is often called the Great Silence.
Questions about Fermi and SETI
The gap between expected life prevalence and actual findings raises questions known as Fermi's paradox. Sixty years after Project Ozma began, researchers still ask if we are alone. Scientists now listen for radio signals and other technosignatures from space.
Efforts to send messages outward
In addition to listening, efforts have been made to send messages into space. These projects aim to make contact with an extraterrestrial intelligence. The practice of sending such messages is known as METI.
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