A Bit More Detail

Assorted Personal Notations, Essays, and Other Jottings

Posts Tagged ‘extraterrestrial life

[BLOG] Some Friday links

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  • blogTO notes that an abandoned Toronto power plant is set to become an arts hub, despite being unreachable by transit at present.
  • Crooked Timber argues against letting the Paris attacks lead to an anti-refugee backlash.
  • The Dragon’s Gaze notes a new study of the complex WASP-47 planetary system.
  • The Dragon’s Tales notes the search for Archean-like atmospheres.
  • Far Outliers follows a Soviet soldier in Afghanistan who became a Muslim convert.
  • Joe. My. God. notes that the company bought by a man who increased the price of a drug used to treat an AIDS-related infection hugely is now suffering major losses.
  • Language Log comes up with an origin for the Chinese word for pineapple in Vietnamese.
  • Steve Munro updates readers on the Port Lands development.
  • Torontoist notes how a Toronto critic of Gamergaters has been smeared as a terrorist implicated in the Paris attacks.
  • Window on Eurasia notes the deep divisions of Russia’s Muslims over ISIS.

[BLOG] Some Monday links

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  • The Broadside Blog’s Caitlin Kelly writes about the things important to her.
  • Crooked Timber’s Chris Bertram shares a quietly beautiful picture of a Paris café late at night.
  • The Dragon’s Gaze notes a paper suggesting that atmospheric haze on exoplanets might be a biosignature.
  • The Dragon’s Tales notes that the Earth appears not to have gotten its water from comets, and examines the geology of Mars’ massive Hellas crater.
  • Far Outliers notes initial Soviet goals in Afghanistan and looks at Soviet reluctance to get involved.
  • Joe. My. God. notes panic in the Republican Party establishment over a possible victory of Carson or Trump.
  • Language Hat notes some online resources on Beowulf and the Hittite language.
  • pollotenchegg maps the distribution of ethnic Germans in Ukraine in 1926.
  • Torontoist notes an architecturally sensitive data centre on Cabbagetown’s Parliament Street.
  • Towleroad notes Ukraine’s passage of a LGBT employment non-discrimination bill.
  • Window on Eurasia notes Putin’s attempt at forming an anti-globalist coalition and notes Russian opinions about Western passivity.

[BLOG] Some Wednesday links

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  • blogTO ranks Toronto’s newest neighbourhoods from best to worst.
  • The Dragon’s Gaze suggests exoplanets which receive between 60 to 90% of the energy the Earth received are likely to support broadly Earth-like conditions.
  • The Dragon’s Tales links to a paper suggesting the solar system likely did not eject a fifth gas giant and looks at what happened to the very early crust of the Earth.
  • Language Hat talks about the language use of writer Raymond Federman and tries to find a story with an unusual method of inputting Japanese.
  • Marginal Revolution notes dropping fluency in English in China.
  • The Power and the Money’s Noel Maurer describes how he kicked a man dressed as Adolf Hitler out of a Halloween party.
  • Towleroad notes an interracial German-Thai gay couple mocked on social media has married.
  • Window on Eurasia wonders whether Russia will use the recent crash of a Russian plane in the Sinai to justify a widened war.

[BLOG] Some Tuesday links

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  • blogTO notes an upcoming Instagram meetup here in Toronto.
  • Centauri Dreams notes the latest Voyager 1 findings on interstellar space.
  • The Dragon’s Gaze notes exoplanets orbiting red dwarfs are more likely to exhibit high abiotic levels of atmospheric oxygen.
  • The Dragon’s Tales reports on the news Chinese C919 jet plane, meant to compete with Airbus and Boeing.
  • Geocurrents maps religion in insular Southeast Asia.
  • Joe. My. God. and Towleroad both look at how Yusuf Mack, an American boxer who claimed he was drugged into participating in a gay porn film, has actually come out via a convincing apology.
  • Marginal Revolution wonders why short-term interest rates are negative.
  • The Planetary Society Blog’s Emily Lakdawalla shares her updated chart showing the round worlds of the solar system.
  • Spacing argues for the importance of urban forestry.
  • Towleroad notes same-sex couples in the United States who, having made use of adoption to create a legal relationship, are now unable to marry.
  • Transit Toronto notes ongoing streetcar diversions on Queen Street East.
  • Window on Eurasia notes the harm done to Ukrainians so far by Russia and the dim prospects of this being stopped any time soon.

[BLOG] Some Wednesday links

  • Alpha Sources notes that Eurozone economic sentiment is holding up.
  • Centauri Dreams looks at SETI in the light of KIC 8462852.
  • D-Brief notes predictions that Cassini could determine if Enceladus’ ocean is active enough to support life.
  • The Dragon’s Gaze links to a video presentation examining how habitable planets around Alpha Centauri could be imaged.
  • The Dragon’s Tales has the latest on the Russian war in Syria.
  • Geocurrents is impressed by this map of world religion, so finely and accurately detailed.
  • Language Log notes the oddities of the promotion of China’s next five-year plan.
  • The Map Room is impressed by Martin Vargic’s new book of maps.
  • Personal Reflections’ Jim Belshaw is touring Denmark and noticing the differences and similarities between that Nordic country and his native Australia.
  • The Planetary Society Blog notes workshopping for the location of the first manned Mars landing.
  • The Power and the Money notes that Cristina Kirchner might be setting up her successors to fail, so as to ensure her eventual re-election.
  • Towleroad notes that Italy forced the removal of registries of same-sex marriages contracted outside of the country.
  • Window on Eurasia talks to a Kaliningrad regionalist, notes Dagestanis are not being drafted in the proportions one would expect, and reports that the HIV/AIDS epidemic is out of control.

[FORUM] How would you react if KIC 8462852 turned out to host alien megastructures?

I’ve posted a bit over the past few days about the mysteries of KIC 8462852–is it wholly natural? might it host megastructures built by some unbelievably advanced extraterrestrial civilizations?–because it is such a fascinating idea. The Fermi paradox, the apparent absence of extraterrestrial intelligences in our local environment for no apparent reason, is a real and even worrying issue. It would be almost a relief to find out that the paradox’s answer is not that the Great Filter will cut everyone down, but that we just happen to live in a galactic periphery.

How would I react if KIC 8462852 turned out to host alien megastructures? Continuing the theme of this 2012 [FORUM] post, I would be unreservedly pleased. This would suggest that it might actually be possible for us to survive, and thrive, far into the future. The prospect of any actual threat coming from five hundred parsecs’ distance is something I discount, if only because the likely power of a civilization capable of building megastructures is so overwhelming. If they wanted to get rid of us, they could have done it already.

What say you?

Written by Randy McDonald

October 18, 2015 at 11:19 pm

[BRIEF NOTE] On the unknown extraordinaries of KIC 8462852

Yesterday I shared Ross Anderson’s article at The Atlantic, “The Most Mysterious Star in Our Galaxy”, because of its potential import. KIC 8462852, a star somewhat larger and brighter than the Sun 1500 light years away, hosts something in orbit.

The light pattern suggests there is a big mess of matter circling the star, in tight formation. That would be expected if the star were young. When our solar system first formed, four and a half billion years ago, a messy disk of dust and debris surrounded the sun, before gravity organized it into planets, and rings of rock and ice.

But this unusual star isn’t young. If it were young, it would be surrounded by dust that would give off extra infrared light. There doesn’t seem to be an excess of infrared light around this star.

It appears to be mature.

And yet, there is this mess of objects circling it. A mess big enough to block a substantial number of photons that would have otherwise beamed into the tube of the Kepler Space Telescope. If blind nature deposited this mess around the star, it must have done so recently. Otherwise, it would be gone by now. Gravity would have consolidated it, or it would have been sucked into the star and swallowed, after a brief fiery splash.

One speculation is that this could possibly–just possibly–be the signature of an artificial construction in orbit of the star, something like a Dyson sphere. Centauri Dreams notes that some kind of close exocomet encounter could provide a more reasonable explanation than that of an extraterrestrial civilization at work.

We’re fortunate to have four full years of Kepler data on this target, allowing the authors to explore a range of possibilities. A large-scale impact within the system is the first thing that comes to my mind. On that score, think of something on the scale of the event that caused our own Moon to form. The problem here is the time frame. The collision would have had to occur between observations from the WISE observatory and a large dip in flux (nearly 15%) seen in later Kepler observations, because we would expect such an event to trigger a strong infrared excess that was not seen by WISE. Such an excess could be there now, but this would also mean that we chanced upon an impact that occurred within a window of just a few years.

Coincidences happen, so we can’t rule that out. The paper also considers catastrophic collisions in this star’s analogue to our asteroid belt, as well as the possibility that we are seeing the passage of a disintegrating comet through the system. In this scenario, the comet would have passed well within one AU. [. . .]

But can the comet scenario explain details in the light curves of KIC 8462852? The paper notes how much remains to be explored, but concludes that a cometary explanation is the most consistent with the data. Conceivably a field star might have made its way through this system, triggering instabilities in KIC 8462852’s analogue to the Oort Cloud. There is in fact a small nearby star that whether bound to the system or not could be implicated in cometary infall.

Bad Astronomy’s Phil Plait seems to represent the scientific consensus, in that an alien civilization is not impossible. Regardless, something interesting is definitely around.

I actually kinda like it. I’m not saying it’s right, mind you, just that it’s interesting. Wright isn’t some wild-eyed crackpot; he’s a professional astronomer with a solid background. As he told me when I talked to him over the phone, there’s “a need to hypothesize, but we should also approach it skeptically” (paraphrasing a tweet by another astronomer, David Grinspoon), with which I wholeheartedly agree.

Look, I think it’s pretty obvious this scenario is, um, unlikely. But hey, why not? It’s easy enough to get follow-up observations of the star to check the idea out. It’s low probability but high stakes, so probably worth a shot. And it’s not exactly science fiction; Wright and a few other astronomers have submitted a paper (pending publication) to the prestigious Astrophysical Journal examining the physics of these structures and detailing how they could be detected around other stars.

As reported in the Atlantic (which is what started all the social media interest in the first place), Wright and Boyajian are indeed proposing to use a radio telescope to look for signals from the star. An alien civilization building such a structure might leak (or broadcast!) radio waves that could be detectable from 1,500 light-years away. That’s the whole basis of SETI, the Search for Extraterrestrial Intelligence (see the movie Contact, or better yet read the book, for more on this). Telescope time is controlled by a committee, and it’s not clear if the proposal will pass or not. I hope so; it shouldn’t take too much telescope time, and under modest assumptions it shouldn’t be too hard to detect a signal.

If one exists. This is still a very, very long shot. But again, this isn’t a huge effort costing zillions of dollars. The effort is minimal, but the payoff could be pretty big. Also, radio observations of the star might prove useful in solving the mystery, even if it’s not aliens. Which, I’ll reiterate, it really likely isn’t.

I would also support follow-up observations (as indicated in the Boyajian paper) looking for signals from comets. Some molecules in comets glow quite brightly when comets get near a star, and that signal may not be too difficult to detect either. Also, there could simply be natural possibilities no one has thought of yet. More observations means stirring the pot a little more and could inspire new thinking.

The important thing is that, although Kepler had a huge sample size, the number of stars studied are only a very small percentage of the total number of stars in the galaxy. What wonders remain to be found around those?

Written by Randy McDonald

October 15, 2015 at 2:15 am


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