The controversy over interstellar messaging

February 20, 2015 by Paul Patton, Universe Today
The prospect of alien invasion has sent shivers down the spines of science fiction fans ever since H. G. Wells published his classic “The War of the Worlds” in 1897. Drawing on the science of his times, Wells envisioned Mars as an arid dying world, whose inhabitants coveted the lush blue Earth. Although opponents of METI seldom explicitly invoke the spectre of alien invasion, some do believe that we must take into account the possibility that extraterrestrials may mean to harm us. The illustration from Well’s novel shows a Martian fighting machine attacking the British warship HMS Thunderchild. Credit: Henrique Alvim Correa, 1906, for the novel “The War of the Worlds”

Should we beam messages into deep space, announcing our presence to any extraterrestrial civilizations that might be out there? Or, should we just listen? Since the beginnings of the modern Search for Extraterrestrial Intelligence (SETI), radio astronomers have, for the most part, followed the listening strategy.
In 1999, that consensus was shattered. Without consulting with other members of the community of scientists involved in SETI, a team of radio astronomers at the Evpatoria Radar Telescope in Crimea, led by Alexander Zaitsev, beamed an interstellar message called 'Cosmic Call' to four nearby sun-like stars. The project was funded by an American company called Team Encounter and used proceeds obtained by allowing members of the general public to submit text and images for the message in exchange for a fee.

Similar additional transmissions were made from Evpatoria in 2001, 2003, and 2008. In all, transmissions were sent towards twenty stars within less than 100 light years of the sun. The new strategy was called Messaging to Extraterrestrial Intelligence (METI). Although Zaitsev was not the first to transmit an interstellar message, he and his associates where the first to systematically broadcast to nearby stars. The 70 meter radar telescope at Evpatoria is the second largest radar telescope in the world.

In the wake of the Evpatoria transmissions a number of smaller former NASA tracking and research stations collected revenue by making METI transmissions as commercially funded publicity stunts. These included a transmission in the fictional Klingon language from Star Trek to promote the premier of an opera, a Dorito's commercial, and the entirety of the 2008 remake of the classic movie "The Day the Earth Stood Still". The specifications of these commercial signals have not been made public, but they were most likely much too faint to be detectable at interstellar distances with instruments comparable to those possessed by humans.

Zaitsev's actions stirred divisive controversy among the community of scientists and scholars concerned with the field. The two sides of the debate faced off in a recent special issue of the Journal of the British Interplanetary Society, resulting from a live debate sponsored in 2010 by the Royal Society at Buckinghamshire, north of London, England.

Modern SETI got its start in 1959, when astrophysicists Giuseppe Cocconi and Phillip Morrison published a paper in the prestigious scientific journal Nature, in which they showed that the of the time were capable of receiving signals transmitted by similar counterparts at the distances of nearby stars. Just months later, radio astronomer Frank Drake turned an 85 foot radio telescope dish towards two nearby sun-like stars and conducted Project Ozma, the first SETI listening experiment. Morrison, Drake, and the young Carl Sagan supposed that would "do the heavy lifting" of establishing powerful and expensive radio beacons announcing their presence. Humans, as cosmic newcomers that had just invented radio telescopes, should search and listen. There was no need to take the risk, however small, of revealing our presence to potentially hostile aliens.

Drake and Sagan did indulge in one seeming exception to their own moratorium. In 1974, the pair devised a brief 1679 bit message that was transmitted from the giant Arecibo Radar Telescope in Puerto Rico. But the transmission was not a serious attempt at interstellar messaging. By intent, it was aimed at a vastly distant star cluster 25,000 light years away. It merely served to demonstrate the new capabilities of the telescope at a rededication ceremony after a major upgrade.

In the 1980's and 90's SETI researchers and scholars sought to formulate a set of informal rules for the conduct of their research. The First SETI Protocol specified that any reply to a confirmed alien message must be preceded by international consultations, and an agreement on the content of the reply. It was silent on the issue of transmissions sent prior to the discovery of an extraterrestrial signal.

A Second SETI Protocol was to have addressed the issue, but, somewhere along the way, critics charge, something went wrong. David Brin, a space scientist, futurist consultant, and science fiction writer was a participant in the protocol discussion. He charged that "collegial discussion started falling apart" and "drastic alterations of earlier consensus agreements were rubber-stamped, with the blatant goal of removing all obstacles from the path of those pursuing METI".
Brin accuses "the core community that clusters around the SETI Institute in Silicon Valley, California", including astronomers Jill Tartar and Seth Shostak of "running interference for and enabling others around the world- such as Russian radio astronomer Dr. Alexander Zaitsev" to engage in METI efforts. Shostak denies this, and claims he simply sees no clear criteria for regulating such transmissions.

Brin, along with Michael A. G. Michaud, a former U.S. Foreign Service Officer and diplomat who chaired the committee that formulated the first and second protocol, and John Billingham, the former head of NASA's short lived SETI effort, resigned their memberships in SETI related committees to protest the alterations to the second protocol.

The founders of SETI felt that was likely to be benign. Carl Sagan speculated that extraterrestrial civilizations (ETCs) older than ours would, under the pressure of necessity, become peaceful and environmentally responsible, because those that didn't would self-destruct. Extraterrestrials, they supposed, would engage in interstellar messaging because of a wish to share their knowledge and learn from others. They supposed that ETCs would establish powerful omnidirectional beacons in order to assist others in finding them and joining a communications network that might span the galaxy. Most SETI searches have been optimized for detecting such steady constantly transmitting beacons.

Over the fifty years since the beginnings of SETI, searches have been sporadic and plagued with constant funding problems. The space of possible directions, frequencies, and coding strategies has only barely been sampled so far. Still, David Brin contends that whole swaths of possibilities have been eliminated "including gaudy tutorial beacons that advanced ETCs would supposedly erect, blaring helpful insights to aid all newcomers along the rocky paths". The absence of obvious, easily detectable evidence of extraterrestrial intelligence has led some to speak of the "Great Silence". Something, Brin notes, "has kept the prevalence and visibility of ETCs below our threshold of observation". If alien civilizations are being quiet, could it be that they know something that we don't know about some danger?

Alexander Zaitsev thinks that such fears are unfounded, but that other civilizations might suffer from the same reluctance to transmit that he sees as plaguing humanity. Humanity, he thinks, should break the silence by beaming messages to its possible neighbors. He compares the current state of humanity to that of a man trapped in a one-man prison cell. "We", he writes "do not want to live in a cocoon, in a 'one –man cell', without any rights to send a message outside, because such a life is not INTERESTING! Civilizations forced to hide and tremble because of farfetched fears are doomed to extinction". He notes that in the '60's astronomer Sebastian von Hoerner speculated that civilizations that don't engage in interstellar communication eventually decline through "loss of interest".

METI critics maintain that questions of whether or not to send powerful, targeted, narrowly beamed interstellar transmissions, and of what the content of those transmissions should be needs to be the subject of broad international and public discussion. Until such discussion has taken place, they want a temporary moratorium on such transmissions.

On the other hand, SETI Institute radio astronomer Seth Shostak thinks that such deliberations would be pointless. Signals already leak into space from radio and television broadcasting, and from civilian and military radar. Although these signals are too faint to be detected at interstellar distances with current human technology, Shostak contends that with the rapid growth in radio telescope technology, ETCs with technology even a few centuries in advance of ours could detect this radio leakage. Billingham and Benford counter that to collect enough energy to tune in on such leakage; an antenna with a surface area of more than 20,000 square kilometers would be needed. This is larger than the city of Chicago. If humans tried to construct such a telescope with current technology it would cost 60 trillion dollars.
Shostak argues that exotic possibilities might be available to a very technologically advanced society. If a telescope were placed at a distance of 550 times the Earth's distance from the sun, it would be in a position to use the sun's gravitational field as a gigantic lens. This would give it an effective collecting area vastly larger than the city of Chicago, for free. If advanced extraterrestrials made use of their star's gravitational field in this way, Shostak maintains "that would give them the capacity to observe many varieties of terrestrial transmissions, and in the optical they would have adequate sensitivity to pick up the glow of street lamps". Even Brin conceded that this idea was "intriguing".

Civilizations in a position to do us potential harm through interstellar travel, Shostak contends, would necessarily be technologically advanced enough to have such capabilities. "We cannot pretend that our present level of activity with respect to broadcasting or radar usage is 'safe'. If danger exists, we're already vulnerable" he concludes. With no clear means to say what extraterrestrials can or can't detect, Shostak feels the SETI community has nothing concrete to contribute to the regulation of radio transmissions.

Could extraterrestrials harm us? In 1897 H. G. Wells published his science fiction classic "The War of the Worlds" in which Earth was invaded by Martians fleeing their arid, dying world. Besides being scientifically plausible in terms of its times, Wells' novel had a political message. An opponent of British colonialism, he wanted his countrymen to imagine what imperialism was like from the other side. Tales of alien invasion have been a staple of science fiction ever since. Some still regard European colonialism as a possible model for how extraterrestrials might treat humanity. The eminent physicist Steven Hawking thinks very advanced civilizations might have mastered interstellar travel. Hawking warned that "If aliens visit us, the outcome would be much as when Columbus landed in America, which didn't turn out well for the Native Americans".

Though dismissing Hawking's fears of alien invasion as an "unlikely speculation", David Brin notes that interstellar travel by small automated probes is quite feasible, and that such a probe could potentially do harm to us in many ways. It might, for example, steer an asteroid onto a collision course with Earth. A relatively small projectile traveling at one tenth the speed of light could wreak terrible damage by simply colliding with our planet. "The list of unlikely, but physically quite possible scenarios is very long" he warns.

Diplomat Michael Michaud warns that "We can all understand the frustration of not finding any signals after fifty years of intermittent searching" but "Impatience with the search is not a sufficient justification for introducing a new level of potential risk for our entire species".

METI critics David Brin, Gregory Benford, and James Billingham think that the current lack of results from SETI warrants a different sort of response than METI. They call for a reassessment of the search strategy. From the outset, SETI researchers have assumed that extraterrestrials will use steady beacons transmitting constantly in all directions to attract our attention. Recent studies of interstellar radio propagation and the economics of signaling show that such a beacon, which would need to operate on a vast timescale, is not an efficient way to signal.

Instead, an alien civilization might compile a list of potentially habitable worlds in its neighborhood and train a narrowly beamed signal on each member of the list in succession. Such brief "ping" messages might be repeated, in sequence, once a year, once a decade, or once a millennium. Benford and Billingham note that most SETI searches would miss this sort of signal.

The SETI Institute's Allen telescope array, for example, is designed to target narrow patches of sky (such as the space around a sun-like star) and search those patches in sequence, for the presence of continuously transmitting beacons. It would miss a transient "ping" signal, because it would be unlikely to be looking in the right place at the right time. Ironically, the Evpatoria messages, transmitted for less than a day, are examples of such transient signals.

Benford and Billingham propose the construction of a new radio telescope array designed to constantly monitor the galactic plane (where stars are most abundant) for transient signals. Such a telescope array, they estimate, would cost about 12 million dollars, whereas a serious, sustained METI program would cost billions.

The METI controversy continues. On February 13, the two camps debated each other at the American Association for the Advancement of Science conference in San Jose, California. At that conference David Brin commented "It's an area where opinion rules, and everyone has a fierce opinion". In the wake of the meeting a group of 28 scientists, scholars, and business leaders issued a statement that "We feel the decision whether or not to transmit must be based on a worldwide consensus, and not a decision based on the wishes of a few individuals with access to powerful communications equipment".

Explore further: SETI scientists say it's time to send messages to ET

More information: J. Benford, J. Billingham, D. Brin, S. Dumas, M. Michaud, S. Shostak, A. Zaitsev, (2014) "Messaging to Extraterrestrial Intelligence special section," Journal of the British Interplanetary Society, 67, p. 5-43. www.jbis.org.uk/year.php?y=2014

D. Brin, "Shouting at the cosmos: How SETI has taken a worrisome turn into dangerous territory." www.davidbrin.com/shouldsetitransmit.html

E. Hand (2015), "Researchers call for interstellar messages to alien civilizations," Science Insider, Science Magazine. news.sciencemag.org/space/2015 … -alien-civilizations

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16 comments

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mercifulone83
not rated yet Feb 20, 2015
In regards to this article, did anyone ever consider the idea that, maybe we are known by our stellar neighbor(s), and that they are just not interested in us?
Traltizer
not rated yet Feb 20, 2015
Sorry, but the argument against interstellar messaging went out the window with the first over-the-air TV broadcasts in the 1940s...
Mayday
not rated yet Feb 20, 2015
Have you not read the news of the world lately?? It appears that the best course of action might be to send an SOS signal as soon as possible.
aennen
not rated yet Feb 20, 2015
Sounds to me like parnoia and the boogey man.
Whydening Gyre
4.5 / 5 (2) Feb 20, 2015
In regards to this article, did anyone ever consider the idea that, maybe we are known by our stellar neighbor(s), and that they are just not interested in us?

They're avoiding us like the plague...:-)

Sorry, but the argument against interstellar messaging went out the window with the first over-the-air TV broadcasts in the 1940s...

Prob'ly more like Tesla's experiments in the 1890's...
Have you not read the news of the world lately?? It appears that the best course of action might be to send an SOS signal as soon as possible.

Ha! Haven't you figured it out yet? It's a test to see if we're ready...
Mimath224
5 / 5 (1) Feb 20, 2015
@Whydening Gyre, it's difficult eh? I think critics would prevent someone spending the money for other reasons. But I rather think that alien life on par with ours might have detected Earth as 'exo-planet' and any more advanced might already be on its way...for similar reasons that we might do.
'...If alien civilizations are being quiet, could it be that they know something that we don't know about some danger?...'
might also be valid.
Whydening Gyre
5 / 5 (2) Feb 20, 2015
@Whydening Gyre, it's difficult eh? I think critics would prevent someone spending the money for other reasons. But I rather think that alien life on par with ours might have detected Earth as 'exo-planet' and any more advanced might already be on its way...for similar reasons that we might do.
'...If alien civilizations are being quiet, could it be that they know something that we don't know about some danger?...'
might also be valid.

Mimath... There's ALWAYS a danger right in front of our faces. It's the nature of exciting entertainment. JJ Abrams (the latest 2 Star Trek's) couldn't direct this any better...:-)
Science Officer
not rated yet Feb 21, 2015
I thought they didn't make First Contact, until after we had demonstrated warp drive capability?
TheGhostofOtto1923
1 / 5 (2) Feb 21, 2015
Mimath... There's ALWAYS a danger right in front of our faces. It's the nature of exciting entertainment. JJ Abrams (the latest 2 Star Trek's) couldn't direct this any better...:-)
The last 2 star treks sucked. A fleet of hard core trekkies from gliese 832 is headed this way seeking revenge. Start digging.
Whydening Gyre
not rated yet Feb 21, 2015
I thought they didn't make First Contact, until after we had demonstrated warp drive capability?

The Enterprise crew did a temporal no-no...
So that the Vulcans could do their schtick "by the book"...
GoodElf
1 / 5 (2) Feb 21, 2015
It really doesn't matter because "aliens" are not listening to such dumb forms of signaling. "Aliens" use interstellar quantum entanglement and the properties of instantaneous quantum steering. What "intelligent" race is going to wait thousands or hundreds of thousands of years to send a single line of text to another civilization? The answer is none. Reality is classical signals would be sent by single entangled teleported quantum states in real time and in both directions.

It is not far fetched that there is a "black monolith" somewhere in our solar system, perhaps close to Earth, that is waiting for us to "take a call". I am not kidding like others on this page.

If "aliens" actually exist then they or their robots are already here and for a very long time. Not for hundreds but for millions of years or even more.

They pose a zero threat level to us. They could have wiped us out when we were still babbling to each other in the trees. Go figure.
xstos
1 / 5 (1) Feb 21, 2015
The same thing that happened to natives in the Americas when the 'white devils' first made landfall will happen to us. We will become slaves to our overlords and most of us will be exterminated.
GoodElf
5 / 5 (2) Feb 21, 2015
I think it is moronic to suggest aliens have the same ambitions we have. We are the ones with shortages of resources down here. Aliens would not have material shortages, the Universe is full of dead planets and metals and water are everywhere. We are simply projecting our mental illnesses onto them. As I said they could have eliminated us a million years ago. If they wanted to, a single tailored virus could have eliminated all of us in a few short days without any of them making themselves known to any of us. Cr*p!! Humans can do that already so what's the issue here.

Be very afraid of other humans. With Sci-Fi Hollywood are simply still fighting "Communism", there will not be any grand Battle for the Earth with Tom Cruise saving us all. If they really wanted it they can get it, and we could do nothing about it. Remember... to get here they would need to be thousands of years "ahead". Whatever purpose or plan they have for us is already in action and it is not as a "fast food joint"
Whydening Gyre
not rated yet Feb 22, 2015
The same thing that happened to natives in the Americas when the 'white devils' first made landfall will happen to us. We will become slaves to our overlords and most of us will be exterminated.

As a more advanced civilization, they would be technologically more "automated" than us. All that automation would eliminate the need for slaves (other than sex ones).
TheGhostofOtto1923
1 / 5 (2) Feb 22, 2015
The same thing that happened to natives in the Americas when the 'white devils' first made landfall will happen to us. We will become slaves to our overlords and most of us will be exterminated.
And what good would human slaves be to a machine singularity that could manufacture unlimited numbers of bots for whatever purpose it saw fit?

But it wouldn't. Singularities would be very economical in terms of expending energy and consuming resources, as they would be interested in surviving for as long as possible.
vlaaing peerd
not rated yet Feb 23, 2015
Considering our own past and being the only reference we have of civilisations encountering new worlds, I don't think it's a good idea revealing our presence.

However, reason enough to assume that if a signal was picked up it will still take ET's the same amount of time to send a signal back and if they were to send something evil our way it would still take at least a 100 somewhat years at least to get to our planet.

The chances of a life sustainable planet that harbours intelligent life within 40~50 light years is very slim (in 50LY, we know +/- 133 stars of which we know contain some 30 planets of which 10 might be in the liquid water zone).

This tells me 1. we are safe for now and probably the next few hundred years and 2. Planets with resources are scarce. I think we'd do well spending those couple of hundred years preparing for a potential encounter and keeping in mind that our planet's resources might be more interesting than having a meet&greet with human beings.

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