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- SEARCH FOR ALIEN LIFE FORMS DRAWS A BLANK 12/02/96
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- Source: Financial Times
- Date: February 12, 1996, Monday
-
- HEADLINE: Search for alien life form draws a blank: Scientists remain
- optimistic that systematic hunt for radio signals will pay off eventually
-
- DATELINE BALTIMORE
-
- By CLIVE COOKSON
-
- We are still alone. The recent discovery of three planets orbiting distant
- stars has given new impetus to the scientific search for extra-terrestrial
- intelligence, known as Seti to its devotees, but no clear signals have yet been
- detected.
-
- The leaders of the world's four main Seti projects, all based in the US, met at
- the American Association for the Advancement of Science conference in Baltimore
- yesterday to review progress - or the lack of it. All the participants said
- they remained optimistic that their strategy - to search the sky systematically
- for microwave radio signals from alien civilisations - would pay off
- eventually.
-
- And they hoped that publicity over the discovery of new planetary systems would
- bring in private research funds to support Seti.
-
- The US Congress cut off public funding through the space agency Nasa in 1993 as
- some politicians portrayed the scientific search for extraterrestrial
- intelligence as being little different from the unscientific investigations of
- UFOs and alien abductions.
-
- In fact, said Prof Lori Marino of Emory University, one of the conference
- organisers, 'Seti is pursued using the scientific method. It is as different
- from the pseudoscience of UFOs as any college course in physics or chemistry
- would be.'
-
- None of the four groups has found clear evidence of intelligent signals from
- outer space, despite occasional claims to the contrary in the media. Hundreds
- of stars, including those recently discovered to have planets, have been
- scanned without success.
-
- 'Absence of evidence is not evidence of absence of extra-terrestrial
- civilisations,' said Prof Dan Werthimer, head of the Serendip search at the
- University of California, Berkeley. 'Our civilisation is just beginning to
- develop the techniques, and our capabilities for search are doubling every
- year.'
-
- Perhaps the most puzzling signal detected so far was recorded in 1977 at Ohio
- State University's radio telescope. This so-called 'Wow' signal - named after
- the scientists' initial reaction to it - was an 'astoundingly strong' burst of
- microwave radiation in an extremely narrow band, said Professor Robert Dixon of
- Ohio State.
-
- The Wow signal could not have originated from any known natural process, but
- unfortunately it lasted only for a minute and, despite many searches over the
- years at the same frequency, has not been heard again.
-
- Prof Dixon said yesterday that he was about to re-analyse recordings of the
- signal, with a grant from the Planetary Society, in an attempt to solve the
- mystery. Meanwhile, radio signals from Earth radiate out through the cosmos.
- 'Early television broadcasts such as 'I Love Lucy' have gone past several
- thousand stars so far,' said Prof Werthimer. 'Perhaps we will one day intercept
- another, civilisation's unintentional leakage or even an intentional message
- beamed our way.'
-
-
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