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“It was kind of unbelievable that it was real data,” said Yale University astronomer <a href="http://www.astro.yale.edu/tabetha/Site/Welcome.html">Tabetha Boyajian</a>. “We were scratching our heads. For any idea that came up there was always something that would argue against it.”

She was talking to <a href="https://www.newscientist.com/article/dn28191-citizen-scientists-catch-cloud-of-comets-orbiting-distant-star/">the New Scientist</a> about KIC 8462852, a distant star with a very unusual flickering habit. Something was making the star dim drastically every few years, and she wasn’t sure what.

Boyajian wrote up a <a href="http://arxiv.org/pdf/1509.03622v1.pdf">paper</a> on possible explanations for the star’s bizarre behavior, and it was published recently in the Monthly Notices of the Royal Astronomical Society. But she also sent her data to fellow astronomer <a href="http://sites.psu.edu/astrowright/jason-t-wright-assistant-professor-of-astronomy-and-astrophysics/">Jason Wright</a>, a Penn State University researcher who helped developed a protocol for seeking signs of unearthly civilization, wondering what he would make of it.

To Wright, it looked like the kind of star he and his colleagues had been waiting for. If none of the ordinary reasons for the star’s flux quite seemed to fit, perhaps an extraordinary one was in order.

Or, to be more specific, something built by aliens — a “swarm of megastructures,” as he told <a href="http://www.theatlantic.com/science/archive/2015/10/the-most-interesting-star-in-our-galaxy/410023/">the Atlantic</a>, likely outfitted with solar panels to collect energy from the star.

<em>[<a href="http://www.washingtonpost.com/news/speaking-of-science/wp/2015/10/15/no-we-havent-discovered-alien-megastructures-around-a-distant-star/">No, we haven’t discovered alien megastructures around a distant star</a>]</em>

“When [Boyajian] showed me the data, I was fascinated by how crazy it looked,” Wright said. “Aliens should always be the very last hypothesis you consider, but this looked like something you would expect an alien civilization to build.”

To be sure, both Boyajian and Wright believe the possibility of alien megastructures around KIC 8462852 is very, very remote. It’s worthy of hypothesis, Wright told <a href="http://www.slate.com/blogs/bad_astronomy/2015/10/14/weird_star_strange_dips_in_brightness_are_a_bit_baffling.html">Slate</a>, “but we should also approach it skeptically.”

Yet compared to the vast majority of supposed sightings of signs of extraterrestrial life, this one has some credibility. Here’s why:

KIC 8462852 was discovered through Planet Hunters, a citizen science program <a href="http://news.yale.edu/2010/12/16/citizen-scientists-join-search-earth-planets">launched at Yale University</a> in 2010. Using data from the Kepler Space Telescope, volunteers sift through records of brightness levels from roughly 150,000 stars beyond our solar system.

Ordinarily, planet hunters are looking for the telltale drops in brightness that happen when a planet crosses in front of its sun. That’s how we identify planets now — brief interruptions in the progress of light as it makes its way toward Earth. Not a presence, but an absence. Already the project has uncovered a few <a href="http://www.bbc.com/news/science-environment-19950923">confirmed planets</a> and at least several dozen more planet candidates.

But one finding from the program was unlike anything else scientists had ever seen. Volunteers marked it out as unusual in 2011, right after the program started: a star whose light curves seemed to dip tremendously at irregular intervals. At one point, about 800 days into the survey, the star’s brightness dropped by 15 percent. Later, around day 1,500, it dropped by a shocking 22 percent. Whatever was causing the dips, it could not have been a planet — even a Jupiter-sized planet, the biggest in our solar system, would only dim this star by 1 percent as it transited across, <a href="http://www.slate.com/blogs/bad_astronomy/2015/10/14/weird_star_strange_dips_in_brightness_are_a_bit_baffling.html">Slate reported</a>. (The Kepler telescope was badly damaged in 2013, so the researchers don’t have data from more recent dips, if there were any).

Another natural force must be at work here.

In their paper, Boyajian and her colleagues went to great lengths to review and refute the more obvious explanations for the odd display. It wasn’t a mistake, caused by a problem the telescope or their data processors — they checked their data with the Kepler mission team, and found no problems for nearby stars when they checked their light curves against neighboring sources.

It wasn’t the star’s fault either. Some young stars, still in the process of accumulating mass, will be surrounded by a whirl of orbiting dust and rock and gas that can blur or block their light. But this star wasn’t young, Boyajian found. Nor did it look like other kinds of stars that demonstrate this light variability.

Something must be blocking the star’s light from the outside, the paper concluded — maybe catastrophic crashes in the asteroid belt, maybe a giant collision in the planetary system that spewed debris into the solar system, maybe small proto-planets shrouded in a Pig-Pen-like cloud of dust. But every explanation was lacking in some way, with the exception of one: Perhaps a family of comets orbiting KIC 8462852 had been disturbed by the passage of another nearby star. That would have sent chunks of ice and rock flying inward, explaining both the dips and their irregularity.

It would be “an extraordinary coincidence,” as the Atlantic put it, for that to have happened at exactly the right moment for humans to catch it on a telescope that’s only been aloft since 2009. “That’s a narrow band of time, cosmically speaking.”

Then again, KIC 8462852 itself is extraordinary. Of the 150,000 or so stars within view of the Kepler Telescope, it is the only one to flicker and dim in this unusual way.

Boyajian’s paper only looks at “natural” explanations for the phenomenon, she told the <a href="http://www.theatlantic.com/science/archive/2015/10/the-most-interesting-star-in-our-galaxy/410023/">Atlantic</a>. But she’s open to looking at unnatural ones, which is where Wright and his “swarm of megastructures” theory come in.

Scientists — at least, the ones who like to theorize about these things — have long said that an advanced alien civilization would be marked by its ability to harness the energy from its sun (rather than scrabbling over its planet’s resources like us puny earthlings). They envision something like a <a href="http://www.popularmechanics.com/space/deep-space/a11098/could-we-build-a-dyson-sphere-17110415/">Dyson Sphere</a>, a hypothetical megastructure first proposed by physicist Freeman Dyson that would orbit or even encompass a star, capturing its power and putting it to use.

Obviously, a Dyson sphere has never been spotted in real life, though they’re all over <a href="https://www.youtube.com/watch?v=ECLvFLkvY7Y">science fiction</a>. But if one were to exist, it wouldn’t look like a metal ball around the sun — it would probably comprise a chain of smaller satellites or space habitats, something that would block its star’s light as weirdly and irregularly as the light of KIC 8462852 has been blocked. That’s why researchers who are interested in finding alien life are so excited about the finding.

Boyajian, Wright and <a href="https://seti.berkeley.edu/siemion">Andrew Siemion</a>, the director of the Search for Extraterrestrial Intelligence Research Center at the University of California, Berkeley, are now working on getting access to the massive radio dishes they can point at the star in search of the kinds of radio waves usually emitted by technology.

If they find them — well, that would be very big and very, very unlikely news.

Of course, the star in question is about 1,481 light-years away from Earth — meaning that even if aliens did create a giant solar panel complex out there, they did so in the 6th century, while we were emptying chamber pots out of second story windows and fighting off the first bubonic plague pandemic.

Quite a bit has changed on Earth since then. Who knows what could have happened around KIC 8462852?

Oct. 10, 2016

Sept. 8, 2016

May 9, 2016

April 17, 2016

2019 Walter Sullivan Award for Excellence in Science Journalism–Features; 2020 AAAS Kavli Science Journalism Award - Silver; 2023 Evert Clark/Seth Payne Award for a young science journalist

Georgetown University, B.S. in International Culture and Politics

Sarah Kaplan is a climate reporter covering humanity's response to a warming world. She previously reported on Earth science and the universe.  

Sarah Kaplan

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