SETI at Green Bank Observatory Turns to Tabby’s Star for Answers. Bob Zimmerman,



(Photo: The Robert C. Byrd Green Bank Radio Telescope (GBT) focuses 2.3 acres of radio light. It is 485ft tall, nearly as tall as the nearby mountains and much taller than pine trees in the national forest. The telescope is in a valley of the Allegheny mountains to shield the observations from radio interference.)

Twitter: @batchelorshow

SETI at Green Bank Observatory Turns to Tabby’s Star for Answers. Bob Zimmerman,

“First reported in September 2015 by Boyajian, then a postdoc at Yale University, Tabby’s star – more properly called KIC 8462852 – had been flagged by citizen scientists because of its unusual pattern of dimming. These volunteers were looking at stars as part of the internet project Planet Hunters, which allows the public to search for planets around other stars in data taken by NASA’s Kepler spacecraft, which has been monitoring 150,000 stars for regular dimming that might indicate a planet had passed in front of it.

But while most such dimming by transiting planets is brief, regular and blocks just 1 or 2 percent of the light of the star, Tabby’s star dims for days at a time, by as much as 22 percent, and at irregular intervals.

While Boyajian speculated in her 2015 paper that the irregular dimming might be explained by a swarm of comets breaking up as it approached the star, subsequent observations show the star, which is located about 1,500 light-years from Earth in the constellation Cygnus, is far more irregular than a comet swarm would produce. In fact, it seems to have been dimming at a steady rate for the past century.

Speculation eventually arose that the dimming was caused by a Dyson structure: a massive orbiting array of solar collectors that physicist Freeman Dyson once proposed would be a natural thing for a civilization to build as it needed more and more energy to power itself. Theoretically, such a structure could completely surround the star – what he termed a Dyson sphere – and capture nearly all the star’s energy….”


If intelligent aliens actually do live around Tabby's star, astronomers are determined to find them.

The Breakthrough Listen initiative, which will spend $100 million over the next 10 years to hunt for signals possibly produced by alien civilizations, is set to begin studying Tabby's star with the 330-foot-wide (100 meters) Green Bank Telescope in West Virginia, project team members announced Tuesday (Oct. 25).

Oct 28, 2016, 06:18 AM
You need to be to post a comment