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 Post subject: SETI Thread
PostPosted: Sat Apr 30, 2016 8:38 am 
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Physicists have calculated that we're *probably* not the only advanced civilisation ever in the Universe

http://www.sciencealert.com/physicists- ... e-universe

More aspects of the Drake Equation are becoming better known, but one variable remains up to speculation: The average age of a civilization.

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Quote:
"Rather than asking how many civilisations may exist now, we ask 'Are we the only technological species that has ever arisen?'" said fellow researcher Woodruff Sullivan from the University of Washington. "This shifted focus eliminates the uncertainty of the civilisation lifetime question and allows us to address what we call the 'cosmic archaeological question' – how often in the history of the universe has life evolved to an advanced state?"

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 Post subject: Re: SETI Thread
PostPosted: Tue Sep 06, 2016 6:16 pm 
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Our Sky Now and Then: Searches for Lost Stars and Impossible Effects as Probes of Advanced Extraterrestrial Civilizations

http://iopscience.iop.org/article/10.38 ... ld.iop.org

Quote:
Searches for extraterrestrial intelligence using large survey data often look for possible signatures of astroengineering. We propose searching for physically impossible effects caused by highly advanced technology by carrying out a search for disappearing galaxies and Milky Way stars. We select ~10 million objects from USNO-B1.0 with low proper motions (μ < 20 mas yr−1) imaged on the sky in two epochs. We search for objects not found at the expected positions in the Sloan Digital Sky Survey (SDSS) by visually examining images of ~290,000 USNO-B1.0 objects with no counterpart in the SDSS. We identify some spurious targets in the USNO-B1.0. We find one candidate of interest for follow-up photometry, although it is very uncertain. If the candidate eventually is found, it defines the probability of observing a disappearing-object event in the last decade to less than one in one million in the given samples. Nevertheless, because the complete USNO-B1.0 data set is 100 times larger than any of our samples, we propose an easily accessible citizen science project in search of USNO-B1.0 objects that have disappeared from the SDSS.

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 Post subject: Re: SETI Thread
PostPosted: Fri Oct 14, 2016 12:46 pm 
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Are Aliens Trying to Contact You? Use This Handy Scale

https://www.wired.com/2016/10/aliens-tr ... ndy-scale/

Quote:
Essentially, the (so named) Rio scale takes into account the following: What was the observation? (An intriguing radio signal? Flashing laser beams? An actual, physical encounter?); How far away did it originate?; How often did it occur? Those factors, lumped together, are multiplied by the report’s credibility—did it come from a credentialed university group, or some internet rando?

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 Post subject: Re: SETI Thread
PostPosted: Thu Nov 17, 2016 3:56 pm 
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“Breakthrough Listen” SETI Project Could Miss ET’s Phone Call

https://www.wired.com/2016/11/breakthro ... hone-call/

Quote:
That lag between surveillance and study could set the project up to miss signals. “Our philosophy has been that it’s important to look back quickly,” says Jill Tarter, the former head of NASA’s only SETI program, the High-Resolution Microwave Survey, and the SETI Institute’s alien searches. Previous projects, and modern ones like the search at the Allen Telescope Array and METI International’s hunt for laser pulses, process their data in real-time. At the Allen Array, within a few minutes of picking up radio waves, software combs them for signs of significance. If it finds something interesting, the telescope swings back right away to see if the strange thing is still there. After more automated verification tests, the computers alert the humans, right away. The humans take a look, and then, depending, call other humans with telescopes, also right away.

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 Post subject: Re: SETI Thread
PostPosted: Tue Nov 22, 2016 10:01 am 
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SETI Observations of Exoplanets with the Allen Telescope Array

http://iopscience.iop.org/article/10.38 ... 10-40-1-71

Quote:
We report radio SETI observations on a large number of known exoplanets and other nearby star systems using the Allen Telescope Array (ATA). Observations were made over about 19000 hr from 2009 May to 2015 December. This search focused on narrowband radio signals from a set totaling 9293 stars, including 2015 exoplanet stars and Kepler objects of interest and an additional 65 whose planets may be close to their habitable zones. The ATA observations were made using multiple synthesized beams and an anticoincidence filter to help identify terrestrial radio interference. Stars were observed over frequencies from 1 to 9 GHz in multiple bands that avoid strong terrestrial communication frequencies. Data were processed in near-real time for narrowband (0.7–100 Hz) continuous and pulsed signals with transmitter/receiver relative accelerations from −0.3 to 0.3 m s−2. A total of 1.9 × 108 unique signals requiring immediate follow-up were detected in observations covering more than 8 × 106 star-MHz. We detected no persistent signals from extraterrestrial technology exceeding our frequency-dependent sensitivity threshold of 180–310 × 10−26 W m−2.


Original arXiv submission: https://arxiv.org/abs/1607.04207

Please note the link to doi.org is 404 Not Found. A shame since I'd like to see the developments since July 2016.

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 Post subject: Re: SETI Thread
PostPosted: Sun Dec 18, 2016 1:38 pm 
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Extragalactic Lighthouses --"We Can Now Detect Directed Signals From the Depths of the Cosmos"

http://www.dailygalaxy.com/my_weblog/20 ... smos-.html

Quote:
“In our paper, we propose a search strategy that will observe nearly 100 billion planets, allowing us to test our hypothesis that other similarly or more advanced civilizations with this same broadcast capability exist,” Lubin said.


Assuming they're still using radio, rather than some unrealized technology beyond our capabilities.

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 Post subject: Re: SETI Thread
PostPosted: Thu Dec 22, 2016 8:02 pm 
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Scientists are planning a mission to Saturn to search for alien life

http://www.sciencealert.com/scientists- ... alien-life

Quote:
The first is the Enceladus Life Finder (ELF) project, backed by NASA, and then there's the Explorer of Enceladus and Titan (E2T) project, supported by both NASA and the European Space Agency.

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 Post subject: Re: SETI Thread
PostPosted: Fri Jan 20, 2017 7:44 pm 
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Astronomer Searches for Signs of Life on Wolf 1061 Exoplanet

http://www.astrowatch.net/2017/01/astro ... -life.html

Quote:
But it’s not just Wolf 1061’s proximity to Earth that made it an attractive subject for Kane and his team. One of the three known planets in the system, a rocky planet called Wolf 1061c, is entirely within the habitable zone. With assistance from collaborators at Tennessee State University and in Geneva, Switzerland, they were able to measure the star around which the planet orbits to gain a clearer picture of whether life could exist there.

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 Post subject: Re: SETI Thread
PostPosted: Tue Jan 24, 2017 10:03 pm 
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The gaming tech that mya help find alien life

http://www.bbc.com/future/story/2017012 ... alien-life

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 Post subject: Re: SETI Thread
PostPosted: Sun Mar 26, 2017 6:49 pm 
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Quantum Communicating with the Extraterrestrial Intelligence

http://www.astrowatch.net/2017/03/quant ... -with.html

Quote:
Another key ingredient in the attempt to quantum communicate with other intelligent forms of life in the universe is a mean to decrypt quantum messages. We should need a quantum key. The quantum key ensures the security of the communication and endow the receiver with the necessary tool to properly asses the content of the message. In the absence of the quantum key we may not be able to properly decipher a hypothetical quantum message ETI may communicate.

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 Post subject: Re: SETI Thread
PostPosted: Wed Apr 19, 2017 6:27 pm 
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Possibility of Silicon-Based Life Grows

http://www.astrobio.net/news-exclusive/ ... ife-grows/

Quote:
The reserachers steered microbes into creating molecules never before seen in nature through a strategy known as 'directed evolution', which Arnold pioneered in the early 1990s. Just as farmers have long modified crops and livestock by breeding generations of organisms for the traits they want to appear, so too have scientists bred microbes to create the molecules they desire.

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 Post subject: Re: SETI Thread
PostPosted: Thu May 18, 2017 9:14 am 
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Finding alien megastructures around nearby pulsars

https://phys.org/news/2017-05-alien-meg ... lsars.html

Quote:
To this, Osmanov has argued that the problem is that we are looking in the wrong places. Last year, he wrote a research paper in which he ventured that an alien super civilization – i.e. one that was consistent with a Level II Kardashev civilization – would likely use ring-like megastructures to harness the power of their stars. This is in contrast to the traditional concept of a "Dyson's Sphere", which would consist of a spherical shell.

Furthermore, he argued that these Dyson Rings would likely be built around pulsars rather than stars, and offered estimates on their dimensions which were dependent on the rotational speed of the pulsar. According to Osmanov's latest study, titled "Are the Dyson rings around pulsars detectable?", Osmanov extends the problem of spotting alien megastructures to the observational realm.

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 Post subject: Re: SETI Thread
PostPosted: Wed May 24, 2017 4:39 pm 
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Here's how we can detect plants on extrasolar planets

https://phys.org/news/2017-05-extrasolar-planets.html

Quote:
For example, and illustrated by the diagram above, green vegetation absorbs almost all the red, green and blue (RGB) parts of the spectrum, but reflects infrared light. This sort of process has been used for decades by Earth observation satellites to track meteorological phenomena, measure the extent of forests and vegetation, track the expansion of population centers, and monitor the growth of deserts.

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 Post subject: Re: SETI Thread
PostPosted: Thu Jun 08, 2017 2:26 pm 
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How Social Media Users Decoded a Simulated Message from Extraterrestrials

https://www.technologyreview.com/s/6080 ... restrials/

Quote:
Last year, one researcher tested this idea by doing exactly that. Rene Heller from the Max Planck Institute for Solar System Research in Germany created a simulated message from an alien civilization and released it on Twitter and Facebook for the world to decode. “On Tuesday, 26 April 2016, I submitted a fake SETI message to the social media Twitter and Facebook and called it the SETI Decrypt Challenge,” say Heller.


AND

Aliens, Comets or Crap? What’s Going On With The Wow! Signal?

http://blogs.discovermagazine.com/d-bri ... ot-aliens/

Quote:
“Bad papers get written and published all the time,” he says. “But this author asked people for money to fund his research, and if you do that you should hold yourself to the highest standards.”

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 Post subject: Re: SETI Thread
PostPosted: Mon Jun 12, 2017 9:01 pm 
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Here's the funny thing about the recent "debunking" of the Wow! Signal.

Antonio Paris is a UFOlogist in addition to being a planetary scientist. One would think he'd be chomping at the bit to prove aliens.

In this case, mainstream astronomers are taking his hypothesis to task. Chris Lintott and others on Twitter have published a list of their questions for Mr. Paris.

https://docs.google.com/document/d/1UD8 ... TPGJc/edit

It seems the world's been turned upside-down in this case. Funny in light of the many mainstream astronomers crying about the cause of KIC 8462852/Boyajian's Star's dimming not being an alien megastructure. Which brings me to something a friend told me on Facebook.

Quote:
(M)any of the assertions of astronomy do not meet the falsifiability criterion in its original strong form because astronomy frequently makes assertions about object too far away and too far back in time to be subject to the observation and experimentation that would make them falsifiable.

(T)he assertions of astronomers are, at present, accepted because they are theoretically falsifiable, even though they are, in practical terms, not.

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 Post subject: Re: SETI Thread
PostPosted: Mon Jun 12, 2017 9:02 pm 
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Yet another article on the Wow! Signal debacle

Was the Legendary "Wow!" Signal Caused by a Comet, Rather Than ET?

http://dailygrail.com/Alien-Nation/2017 ... -Rather-ET

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 Post subject: Re: SETI Thread
PostPosted: Sat Jul 01, 2017 1:06 pm 
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Sun’s gravity could power interstellar video streaming

https://www.newscientist.com/article/21 ... streaming/

Quote:
With the gravitational-lensing effect, a little power would go a long way towards transmitting data back to our solar system. “Around the nearest stars, a handheld laser pointer could do it,” says Hippke. The data rate would be high enough that sending pictures and video is possible, although at present it would still take four years to receive any data stream from as far away as Alpha Centauri.

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 Post subject: Re: SETI Thread
PostPosted: Tue Jul 11, 2017 6:56 am 
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Finding Extraterrestrial Life May Rely on Identifying Traces Rather Than Aliens

https://www.seeker.com/space/finding-ex ... han-aliens

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 Post subject: Re: SETI Thread
PostPosted: Fri Jul 14, 2017 9:13 am 
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Seemingly strange radio signals from a red dwarf star spark interest at Arecibo

https://www.geekwire.com/2017/strange-r ... ibo-radio/

Quote:
“The signals consisted of broadband quasi-periodic non-polarized pulses with very strong dispersion-like features,” Abel Mendez, a planetary astrobiologist at the University of Puerto Rico at Arecibo, said in an online advisory. Mendez is also director of the Planetary Habitability Laboratory.

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 Post subject: Re: SETI Thread
PostPosted: Thu Aug 31, 2017 4:47 pm 
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Strange signals were just spotted coming from a distant galaxy

http://www.popsci.com/strange-signals-distant-galaxy

Quote:
This is a newly active period from an unknown source that astronomers labelled FRB 121102. It’s a source of fast radio bursts (FRBs). We still don’t know much about FRBs. They were only first detected in 2001, and the first time we saw one—this one, in fact—repeat was in 2015. FRBs are exactly what they sound like: super fast, really powerful burst of radio signals. But we have no idea what causes them.


Funny how Mary Beth Griggs says "[W]e have no idea what causes them" but insists they're not aliens.

Why don't they get astronomers, or people who graduated high school, to write at Popular Science?

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 Post subject: Re: SETI Thread
PostPosted: Fri Sep 01, 2017 5:59 pm 
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Ultraviolet Light May Be Ultra Important In Search For Life

http://www.astrowatch.net/2017/09/ultra ... ultra.html

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 Post subject: Re: SETI Thread
PostPosted: Sat Sep 09, 2017 11:14 am 
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Are We Being Watched? Tens of Other Worlds Could Spot the Earth

http://www.astrowatch.net/2017/09/are-w ... other.html

Quote:
In the new study, the authors reverse this concept and ask, “How would an alien observer see the Solar System?” They identified parts of the distant sky from where various planets in our Solar System could be seen to pass in front of the Sun – so-called ‘transit zones’ -- concluding that the terrestrial planets (Mercury, Venus, Earth, and Mars) are actually much more likely to be spotted than the more distant ‘Jovian’ planets (Jupiter, Saturn, Uranus, and Neptune), despite their much larger size.

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 Post subject: Re: SETI Thread
PostPosted: Thu Sep 21, 2017 8:18 pm 
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Study: Mysterious Bursts From Space Occur Every Second

http://blogs.discovermagazine.com/d-bri ... ry-second/

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 Post subject: Re: SETI Thread
PostPosted: Mon Oct 16, 2017 7:56 pm 
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No Aliens Found Yet, But 'Heartbeats' in Universe Heard

http://www.astrowatch.net/2017/10/no-al ... ts-in.html

Quote:
"If we could find a binary star system composed of a pulsar and a black hole, we would be able to study the space-time around the black hole by using the pulsar," Chen said.

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 Post subject: Re: SETI Thread
PostPosted: Mon Oct 30, 2017 2:30 pm 
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Sky Shorts: Chloromethane gas no longer a definite sign of life

http://www.cantonrep.com/entertainmentl ... gn-of-life

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