Newsgroup: it.arti.cinema
Titolo: Si parla di Contact e...

Per chi ancora non ha visto il telegiornale:
http://www.corriere.it/Primo_Piano/Scienze_e_Tecnologie/2004/09_Settembre/02/segnale.shtml
-- 
Stefano
aka Senbee Norimaki
ICQ# 4243376 

 Per chi ancora non ha visto il telegiornale:
Per chi mastica l'inglese, ecco la fonte:
http://www.newscientist.com/news/nographic.jsp?id=ns99996341
-- 
Gwilbor
gwilbor(at)
email.it
"Strano gioco. L'unica mossa vincente è non giocare"

 Per chi ancora non ha visto il telegiornale:
Tranquillo, è un tipo di notizia che ritorna periodicamente.
L'unica cosa fuori dalla norma è che non abbiano chiesto a Margherita Hack,
per l'ennesima volta: "Lei crede in Dio?"

Hello, ugo!
You wrote  on Fri, 3 Sep 2004 21:01:35 +0200:
 > Tranquillo, è un tipo di notizia che ritorna periodicamente.
 > L'unica cosa fuori dalla norma è che non abbiano chiesto a Margherita
 > Hack, per l'ennesima volta: "Lei crede in Dio?"
ROTFL, purtropo è vero :-( Povera Margherita...
Però è la prima volta in effetti che quelli di SETI non smentiscono subito, 
anzi, dicono che potrebbe essere anche un fenomeno sconosciuto ma non 
negano.
Lo so che si rivelerà un nulla di fatto, ma sto trepidando lo stesso...


 Per chi ancora non ha visto il telegiornale:
[cut]
Credo sia un falso allarme. Se devo pensare ad un messaggio extraterrestre,
l'ipotesi "contact" mi sembra la piů plausibile, ovvero mex pensato come un
radiofaro, qualcosa sui numeri primi e non equivocabile con un rumore di
fondo. A meno che il mex in questione non sia intenzionale, tipo emissioni
radio intelligenti legati a radiocomunicazioni.
Ciao
-- 
Natanaele (NCUCDC) ~ le opinioni di un clown ~
e-mail < 
nata...@despammed.com
 >
«No hay banda!...» ~ e manco l'ADSL! ~
Mulholland Drive - 01h:40m:50ss - David Lynch - 2001

 
http://www.newscientist.com/news/nographic.jsp?id=ns99996341
...e per chi legge le news off line...
Mysterious signals from 1000 light years away
In February 2003, astronomers involved in the search for extraterrestrial
intelligence (SETI) pointed the massive radio telescope in Arecibo, Puerto
Rico, at around 200 sections of the sky.
The same telescope had previously detected unexplained radio signals at
least twice from each of these regions, and the astronomers were trying to
reconfirm the findings. The team has now finished analysing the data, and
all the signals seem to have disappeared. Except one, which has got
stronger.
This radio signal, now seen on three separate occasions, is an enigma. It
could be generated by a previously unknown astronomical phenomenon. Or it
could be something much more mundane, maybe an artefact of the telescope
itself.
But it also happens to be the best candidate yet for a contact by
intelligent aliens in the nearly six-year history of the SETI@home project,
which uses programs running as screensavers on millions of personal
computers worldwide to sift through signals picked up by the Arecibo
telescope.
Absorb and emit
“It’s the most interesting signal from SETI@home,” says Dan Werthimer, a
radio astronomer at the University of California, Berkeley (UCB) and the
chief scientist for SETI@home. “We’re not jumping up and down, but we are
continuing to observe it.”
Named SHGb02+14a, the signal has a frequency of about 1420 megahertz. This
happens to be one of the main frequencies at which hydrogen, the most common
element in the universe, readily absorbs and emits energy.
Some astronomers have argued that extraterrestrials trying to advertise
their presence would be likely to transmit at this frequency, and SETI
researchers conventionally scan this part of the radio spectrum.
SHGb02+14a seems to be coming from a point between the constellations Pisces
and Aries, where there is no obvious star or planetary system within 1000
light years. And the transmission is very weak.
“We are looking for something that screams out ‘artificial’,” says UCB
researcher Eric Korpela, who completed the analysis of the signal in April.
“This just doesn’t do that, but it could be because it is distant.”
Unknown signature
The telescope has only observed the signal for about a minute in total,
which is not long enough for astronomers to analyse it thoroughly. But,
Korpela thinks it unlikely SHGb02+14a is the result of any obvious radio
interference or noise, and it does not bear the signature of any known
astronomical object.
That does not mean that only aliens could have produced it. “It may be a
natural phenomenon of a previously undreamed-of kind like I stumbled over,”
says Jocelyn Bell Burnell of the University of Bath, UK.
It was Bell Burnell who in 1967 noticed a pulsed radio signal which the
research team at the time thought was from extraterrestrials but which
turned out to be the first ever sighting of a pulsar.
There are other oddities. For instance, the signal’s frequency is drifting
by between eight to 37 hertz per second. “The signal is moving rapidly in
frequency and you would expect that to happen if you are looking at a
transmitter on a planet that’s rotating very rapidly and where the
civilisation is not correcting the transmission for the motion of the
planet,” Korpela says.
This does not, however, convince Paul Horowitz, a Harvard University
astronomer who looks for alien signals using optical telescopes. He points
out that the SETI@home software corrects for any drift in frequency.
Fishy and puzzling
The fact that the signal continues to drift after this correction is “fishy”
, he says. “If [the aliens] are so smart, they’ll adjust their signal for
their planet’s motion.”
The relatively rapid drift of the signal is also puzzling for other reasons.
A planet would have to be rotating nearly 40 times faster than Earth to have
produced the observed drift; a transmitter on Earth would produce a signal
with a drift of about 1.5 hertz per second.
What is more, if telescopes are observing a signal that is drifting in
frequency, then each time they look for it they should most likely encounter
it at a slightly different frequency. But in the case of SHGb02+14a, every
observation has first been made at 1420 megahertz, before it starts
drifting. “It just boggles my mind,” Korpela says.
The signal could be an artefact that, for some reason, always appears to be
coming from the same point in the sky. The Arecibo telescope has a fixed
dish reflector and scans the skies by changing the position of its receiver
relative to the dish.
When the receiver reaches a certain position, it might just be able to
reflect waves from the ground onto the dish and then back to itself, making
it seem as if the signal was coming from space.
“Perhaps there is an object on the ground near the telescope emitting at
about this frequency,” Korpela says. This could be confirmed by using a
different telescope to listen for SHGb02+14a.
Possible fraud
There is also the possibility of fraud by someone hacking the SETI@home
software to make it return evidence for an extraterrestrial transmission.
However, SHGb02+14a was seen on two different occasions by different
SETI@home users, and those calculations were confirmed by others.
Then the signal was seen a third time by the SETI@home researchers. The
unusual characteristics of the signal also make it unlikely that someone is
playing a prank, Korpela says. “As I can’t think of any way to make a signal
like this, I can’t think of any way to fake it.”
David Anderson, director of SETI@home, remains sceptical but curious about
the signal. ”It’s unlikely to be real but we will definitely be re-observing
it.” Bell Burnell agrees that it is worth persisting with. “If they can see
it four, five or six times it really begins to get exciting,” she says.
It is already exciting for IT engineers Oliver Voelker of Logpoint in
Nuremberg, Germany and Nate Collins of Farin and Associates in Madison,
Wisconsin, who found the signal.
Collins wonders how his bosses will react to company computers finding
aliens. “I might have to explain a little further about just how much I was
using [the computers],” he says.
-- 
2/12/72
mi riservo con fermezza il diritto di contraddirmi

 per l'ennesima volta: "Lei crede in Dio?"
Prima o poi se se uscira' con un "ma maremma bohaiola, anhora sta domanda?".

"ma maremma bohaiola, anhora sta domanda?".
La "c" di "ancora" non si elide nè si aspira.
-- 
Riccardo Caiazzo                 "I'm afraid,
r.ca...@libero.it
                    Dave."

 La "c" di "ancora" non si elide nè si aspira.
Vuol dire che dovevo scrivere "ancora"?

Vuol dire che dovevo scrivere "ancora"?
No, potevi anche scrivere "ermeneutica", volendo.


 wrote in message
news:chadrh$7ta$
1...@reader1.imaginet.fr
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Perché tutti inconsciamente sappiamo che Lei è abbastanza in gamba
da risolversi i problemi da sola. ;-)
-- 
Posted via Mailgate.ORG Server - 
http://www.Mailgate.ORG

 Tranquillo, è un tipo di notizia che ritorna periodicamente.
E che periodicamente viene smentita o ridimensionata:
http://www.corriere.fantascienza.com/NEWS/?2004090604
