Seti, the organization that searches for extraterrestials using radio signals, has so far found nothing

SETI Search For Alien Intelligence Finds Nothing: If There Is An E.T. He’s Not Taking Calls

SETI, the organization that searches for extraterrestials using radio signals, says the likelihood of intelligent alien life is relatively rare throughout our Milky Way galaxy, with fewer than one in a million solar systems containing civilizations advanced enough to send out radio signals.

The new study was researched by a team that includes famed alien life advocate Jill Tarter — the template for the Ellie Arroway character in the late Carl Sagan’s book Contact later made into a film starring Jodie Foster — and others from the Seti Institute.

“No signals of extraterrestial origin were found,” the researchers conclude in the study, which was published in The Astrophysical Journal.

Space.com reports that in their search for alien radio signals, the team selected 86 stars using data from space agency NASA’s Kepler space telescope, and also observed 19 stars that synchronously came into range as they searched the primary targets.

The researchers worked from a list of Kepler planetary candidates which at the time included 1,235 possible exoplanets — that is, planets outside of the solar system. They are also referred to as extrasolar planets. That number has now reached 2,740, with 105 of them confirmed.

The team limited their search to stars that host five or six planet candidates, some of which reside within the habitable zone — the range of distances from a star where liquid water can exist on a world’s surface. The selected stars are about 1,000 light-years to 1,500 light-years from Earth.

It’s understood that radio signals in tight, focused bands are a possible indication of intelligent life, given that humans generate such signals on Earth, The Guardian notes.

Using the Robert C. Byrd Green Bank Telescope in West Virginia, the team searched each star system for five minutes between February and April 2011. Specifically, they examined the planets in a radio-frequency range of 1.1 to 1.9 GHz, which falls between the cell phone and television bands used on Earth.

The SETI researchers searched for radio signals among exoplanets based on a Kepler catalogue of planetary candidates
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