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Finding ET in the Data (Hunt for Dyson spheres heats up)
Centauri Dreams ^ | 4/17/13 | Paul Gilster

Posted on 04/17/2013 9:10:14 AM PDT by LibWhacker

Finding ET in the Data

by Paul Gilster on April 17, 2013

As we saw yesterday, the Infrared Astronomical Satellite (IRAS) has been the source of data for a number of searches for unusual infrared signatures. The idea is to look for the artifacts of advanced extraterrestrial civilizations, under the assumption that a sufficiently advanced culture will be capable of engineering projects that could be detected from light years away. A Dyson sphere, existing either as a completely enclosed star or as a swarm of artifacts around a star, is but one example of such engineering, but it’s a sensible one to look for because it represents a way to maximize energy. It’s also theoretically detectable because of waste heat in the infrared.

These days, though, we have not just IRAS but the Wide-field Infrared Survey Explorer (WISE) and the Spitzer space telescope providing us with infrared data. Richard Carrigan’s pioneering work on interstellar archaeology is now complemented by searches funded by the New Frontiers in Astronomy & Cosmology program, set up by the Templeton Foundation and administered by the University of Chicago. The program has been created to provide grants in areas ranging from our universe’s role in a possible multiverse to the detection of intelligence beyond our Solar System. The team of Jason Wright (Pennsylvania State) and colleagues Steinn Sigurðsson and Matthew Povich is one of three grant winners in a tuned up Dyson artifact hunt.

ringworld (1)

As described by Stephen Battersby in Alien Megaprojects: The Hunt Has Begun, a recent article in New Scientist, this search should be able to expand Carrigan’s observations thousands of times farther, with the ability to detect a Dyson sphere around a Sun-like star almost anywhere in the galaxy. And this gets us into interesting terrain. From the article:

Even such a wide-ranging hunt may not be ambitious enough, according to Wright. He suspects that interstellar travel will prove no harder than constructing a sphere. An alien civilisation with such a high level of technology would spread out and colonise the galaxy in a few million years, building spheres as they go. “I would argue that it’s very hard for a spacefaring civilisation to die out. There are too many lifeboats,” says Wright. “Once you have self-sufficient colonies, you will take over the galaxy – you can’t even try to stop it because you can’t coordinate the actions of the colonies.”

A good point. And if this is the case, we would expect to find Dyson spheres, assuming we’re correct in thinking they represent a reasonable way to maximize the collection of energy. “To find one or a few Dyson spheres in our galaxy,” Wright goes on, “would be very strange.” In other words, there are either going to be a lot of them or none at all, and if there are a lot of them, then we might consider taking the hunt into extra-galactic territory. Wright tells Battersby that a galaxy colonized by a Kardashev Type III civilization should show up as a big, bright object in the infrared data from WISE, clearly flagged by virtue of the fact that it has no optical component.

How likely is it that things like Dyson spheres will ever be built? Wright has written about this on his AstroWright site, from which this quote:

…despite all of the advances in medicine, economics, and civilization generally, we are still growing as a species exponentially. We have long left Malthusian limits behind, and have shown that technology will progress faster than our resource demands. But no technology can give us more energy than hits the Earth until we start talking about spaceships (except for nuclear energy, which is an ultimately finite resource; fossil fuels are, ultimately, just stored energy from sunlight that hit plants millions of years ago, so, again, finite). We will continue to grow as a species until we hit a free energy resource limit, and then in order to further grow we will have to start collecting more solar energy. And we will have to start emitting that energy as waste heat. And that trend, too, will then have to proceed exponentially…

The consequences are interesting to contemplate.

Indeed. The approach is speculative and obviously depends on how an advanced civilization builds its energy collectors. Dyson spheres are one thing, but a thin ring of artifacts around a distant star is not going to be easily flagged even in the WISE data. A second survey, this one with a different approach, is in the hands of Princeton’s Lucianne Walkowicz, who with her four co-investigators will be looking through Kepler data for unusual patterns of variability. Here we’re in familiar territory with the analysis of light curves that has proven so productive in detecting exoplanets.

Will Walkowicz’ team find something spectacular? After all, their proposal is titled “Stellar Lighthouses: Decoding Signatures of Advanced Civilizations in Precision Stellar Photometry,” and any signature of something artificial around a distant star is going to change everything. But this is a search for more than Dyson spheres, just as ‘interstellar archaeology’ comprehends much more than a single postulated technology.

Suppose a distant civilization is using microwave beaming to drive spacecraft, or modifying its star’s makeup to prolong its life? Steinn Sigurðsson, blogging from the New Frontiers in Astronomy & Cosmology conference in 2012, recalled an old Analog story about the discovery of unusual stars, so bizarre that they demand immediate investigation. One turns out to have a convective zone spiked with manganese and one is bright green. The conclusion is that extraterrestrial pranksters are spiking the stars to draw attention. Who knows what may turn up, but as Walkowicz tells Battersby: “We know what transits, starspots and flares looks like, so we are looking for any variation we can’t explain through known astrophysics.”

Geoff Marcy (UC-Berkeley) is also in the hunt, working with the University of Hawaii at Honolulu’s Andrew Howard and John Johnson (Caltech) on the same kind of signal via Kepler data. The data, of course, are already in our possession, though we keep adding to the database. But it’s a fascinating speculation that we may already have detected signs of an extraterrestrial civilization without even realizing it. The hunt for astronomical anomalies means combing through vast amounts of data with a clear view of our own preconceptions and how they might mislead us. Marcy’s team will doubtless find unusual variability in a number of objects that can be explained through conventional means, but finding the inexplicable will get everyone’s attention.



TOPICS: Astronomy; Science
KEYWORDS: aliens; data; dyson; et; extraterrestrial; heat; infrared; iras; kardashev; kepler; spitzer; wise; xplanets
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1 posted on 04/17/2013 9:10:14 AM PDT by LibWhacker
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To: LibWhacker

Kind of like trying to find a college photo of Barry kissing a woman.


2 posted on 04/17/2013 9:12:08 AM PDT by dragonblustar
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To: LibWhacker
I declare ...

In a hunnert years Ingrish will be superceded by ... hell .. if I can't get it NOW, how in hell can I name it THEN ?

I thought there was a killer on the loose in the North Western timber somewhere

3 posted on 04/17/2013 9:17:02 AM PDT by knarf (I say things that are true ... I have no proof ... but they're true)
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To: SunkenCiv
space ping. ;-)

4 posted on 04/17/2013 9:17:03 AM PDT by skinkinthegrass (who'll take tomorrow,$pend it all today;who can take your income,tax it all away..0'Blowfly can :-)
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To: LibWhacker

Wouldn’t it be more of a “dyson cluster” of satelites surrounding a star to capture “most” of it’s output?


5 posted on 04/17/2013 9:18:35 AM PDT by GraceG
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To: LibWhacker

Dyson? Hmm. I knew space was a vacuum, but I didn’t know which brand.


6 posted on 04/17/2013 9:19:43 AM PDT by dangus (Poverty cannot be eradicated as long as the poor remain dependent on the state - Pope Francis)
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To: LibWhacker

My fav episode of Star Trek: The Next Generation is the Dyson sphere episode, but only because Scotty is in it.


7 posted on 04/17/2013 9:19:51 AM PDT by matt1234
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To: GraceG

They’re lookin’ for the Moties!


8 posted on 04/17/2013 9:20:03 AM PDT by Dr. Bogus Pachysandra ( Ya can't pick up a turd by the clean end!)
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To: All

Wasn’t this an episode of ST-TNG?


9 posted on 04/17/2013 9:20:11 AM PDT by Kolath
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To: LibWhacker

Einstein said God doesn’t play Dyson the universe.


10 posted on 04/17/2013 9:20:11 AM PDT by dangus (Poverty cannot be eradicated as long as the poor remain dependent on the state - Pope Francis)
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To: LibWhacker

Wasn’t the Dyson Sphere originally envisioned as a means of hiding from malevolent aliens?


11 posted on 04/17/2013 9:20:35 AM PDT by cripplecreek (REMEMBER THE RIVER RAISIN!)
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To: GraceG
Yup, I think so... But who knows what engineering feats a super-advanced civilization would be capable of?

Getting back to your comment, here's an excerpt from yesterday's Centauri Dreams...

Moving power generation into space is certainly something that would motivate a civilization a good deal more advanced than our own, and using abundant asteroid material, it could spread power generation entirely around the star. Stephen Battersby, who wrote Alien Megaprojects: The Hunt Has Begun, doubts they would create a single shell because it would be gravitationally unstable. But a Dyson ‘swarm’ is more plausible, with hordes of large power stations moving on independent orbits around the star. Dyson, who likes to talk about what is observable rather than what’s probable, thinks we could spot such a project through its waste heat in the infrared.
So, spot on, young lady!
12 posted on 04/17/2013 9:28:03 AM PDT by LibWhacker
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To: matt1234

Awwww, I missed that one!


13 posted on 04/17/2013 9:28:43 AM PDT by LibWhacker
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To: LibWhacker

They found a hidden message from the aliens....”SEND MORE CHUCK BERRY!”


14 posted on 04/17/2013 9:29:44 AM PDT by dfwgator
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To: dangus

You’re on a roll.


15 posted on 04/17/2013 9:29:49 AM PDT by Tijeras_Slim
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16 posted on 04/17/2013 9:30:05 AM PDT by DJ MacWoW (My faith and politics cannot be separated)
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To: cripplecreek

Freeman Dyson’s spheres? Don’t believe so. Never read anything by the man, so I’m not positive about that.


17 posted on 04/17/2013 9:31:39 AM PDT by LibWhacker
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To: matt1234
"Relics"...STNG.

18 posted on 04/17/2013 9:33:15 AM PDT by skinkinthegrass (who'll take tomorrow,$pend it all today;who can take your income,tax it all away..0'Blowfly can :-)
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To: dangus

Lol... I finally got it! :-)


19 posted on 04/17/2013 9:36:18 AM PDT by LibWhacker
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To: dangus

“Dyson? Hmm. I knew space was a vacuum, but I didn’t know which brand.”

Now THAT was good!


20 posted on 04/17/2013 9:42:58 AM PDT by Da Coyote
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