Alien Megastructure Debunked - Astronomers Finally Explain the Weirdest Star in the Universe

Scientists come up with an explanation for the strange dimming of Tabby's star and it doesn't involve aliens.

Among the most recent promises of extraterrestrial contact, the so-called “alien megastructure” has been one of the most exciting. It’s a star that inexplicably dims and brightens, prompting the Penn State astronomer Jason Wright to famously theorize that the explanation might be that it’s not a star at all but a swarm of alien energy-collecting spacecrafts in a Dyson sphere-like formation. But a new study puts a damper on the conspiracy, with scientists now thinking the fluctuations in light are causes by cosmic dust that passes in front of the star.

In 2014, citizen scientists participating in the Planet Hunters project were sifting through data gathered by the Kepler space telescope and discovered the unusual properties of the star KIC 8462852, which is about 50% bigger than our Sun and is located more than 1,000 light years awayThe star later became known as "Tabby’s Star" in honor of the person who did a first proper study of it in 2015 - Louisiana State University astronomer Tabetha Boyajian. What was strange about the star? It dimmed up to 20% at times, raising speculation that something big was passing in front of it at irregular intervals. 

The weirdness of the star’s behavior was a catalyst for a crowdfunding campaign on Kickstarter that resulted in $100,000 in donations from 1,700 people who wanted to fund further research. As a result of this public support, Boyajian was able to buy more ground-based telescope time to observe and collect a trove of new data, which point to dust being behind the star’s light effects.

LSU Astronomer Tabetha Boyajian (center) and her students and research staff. (Left to right) Robert Parks, undergraduate student Rory Bentley, Assistant Professor Tabetha Boyajian, PhD candidate Tyler Ellis, undergrad Katie Nugent, Professor Geoff Clayton and graduate student Emily Safron.

The reason scientists think that dust may be the culprit is because the dimming is not completely opaque, as if something is filtering the light. An opaque object would block out both red and blue light in the same way, but it appears the blue light is blocked much more than red when the star dims. 

“Dust is most likely the reason why the star’s light appears to dim and brighten,” Boyajian said. “The new data shows that different colors of light are being blocked at different intensities. Therefore, whatever is passing between us and the star is not opaque, as would be expected from a planet or alien megastructure.” 

By observing the star during the period from March 2016 to December 2017, the scientists saw four episodes of dipping starlight.  All the updates and findings were constantly shared with the backers via the project’s website “Where’s the Flux?” 

Boyajian reiterated the importance of enthusiastic amateur scientists in discovering the star in the first place and then helping fund additional findings. 

“If it wasn’t for people with an unbiased look on our universe, this unusual star would have been overlooked,” Boyajian said, adding “I am so appreciative of all of the people who have contributed to this in the past year – the citizen scientists and professional astronomers. It’s quite humbling to have all of these people contributing in various ways to help figure it out.”  

Check out Tabetha Boyajian’s TED Talk about the Star:


The research was conducted in partnership with the Las Cumbres Observatory in California.

You can read the new paper here, in The Astrophysical Journal Letters. 

LinkedIn meets Tinder in this mindful networking app

Swipe right to make the connections that could change your career.

Getty Images
Swipe right. Match. Meet over coffee or set up a call.

No, we aren't talking about Tinder. Introducing Shapr, a free app that helps people with synergistic professional goals and skill sets easily meet and collaborate.

Keep reading Show less

26 ultra-rich people own as much as the world's 3.8 billion poorest

The Oxfam report prompted Anand Giridharadas to tweet: "Don't be Pinkered into everything's-getting-better complacency."

Getty Images and Wikimedia Commons
Politics & Current Affairs
  • A new report by Oxfam argues that wealth inequality is causing poverty and misery around the world.
  • In the last year, the world's billionaires saw their wealth increase by 12%, while the poorest 3.8 billion people on the planet lost 11% of their wealth.
  • The report prompted Anand Giridharadas to tweet: "Don't be Pinkered into everything's-getting-better complacency." We explain what Steven Pinker's got to do with it.
Keep reading Show less

People who constantly complain are harmful to your health

Moans, groans, and gripes release stress hormones in the brain.

Photo credit: Getty Images / Stringer

Could you give up complaining for a whole month? That's the crux of this interesting piece by Jessica Hullinger over at Fast Company. Hullinger explores the reasons why humans are so predisposed to griping and why, despite these predispositions, we should all try to complain less. As for no complaining for a month, that was the goal for people enrolled in the Complaint Restraint project.

Participants sought to go the entirety of February without so much as a moan, groan, or bellyache.

Keep reading Show less
  • Facebook and Google began as companies with supposedly noble purposes.
  • Creating a more connected world and indexing the world's information: what could be better than that?
  • But pressure to return value to shareholders came at the expense of their own users.
Keep reading Show less