What is Kepler-22b on ‘Pluribus’? Curious fans, here's all about planet that sent mysterious signal to Earth
The cliffhanger ending of 'Pluribus' Season 1 is giving fans sleepless nights as they speculate about Caro Struka's (Rhea Seehorn) next course of action against the hive mind. While the show may have wrapped up its first season, its carefully crafted universe and the looming threat of collective control continue to dominate headlines. Season 1 also established Kepler-22 as the planet sending mysterious radio signals to Earth, leaving viewers to wonder just how significant this world will be to the future storyline.
In the pilot episode of 'Pluribus', astronomers detect a mysterious radio signal originating roughly 600 light-years away, composed of four tones that ultimately translate into a nucleotide sequence. When scientists recreate the sequence in a lab, it spreads like a virus, linking non-immune humans across the globe into a shared consciousness known as the hive mind, as per Decider. The source of that signal is later clarified in episode 8, when Zosia (Karolina Wydra) reveals to Carol that The Others have traced it back to Kepler-22b.
As Zosia explains, "That's our name for it. We have no idea what they call it," adding that the planet "has a radius roughly twice that of Earth, and we think their planet may be one enormous ocean," before saying, "Sometimes we close our eyes and try to picture it." Zosia tells Carol that humanity may never truly know the beings on Kepler-22b, but insists their gift must be shared with others across the universe, no matter how long it takes. The plan behind that promise is soon revealed, as The Others are constructing a massive antenna powered by the world's energy to transmit a signal into space.
Back home, Carol notes key details on her whiteboard, mentioning Kepler-22b's distance of roughly 640 light-years from Earth, uncertainty about what its inhabitants are like, and the possibility that it is an ocean world, leaving fans to question whether this mysterious planet actually exists beyond the show. While the true purpose of The Joining and the mysterious radio signal in 'Pluribus' may take time to fully unravel, the series draws from real science when it comes to Kepler-22b.
Kepler-22b is a real super-Earth exoplanet discovered by NASA, complete with its own star, Kepler-22, just as described in the show. According to NASA, Kepler-22b is "a potentially rocky world, larger than Earth," with "a radius double the size" and a mass "equivalent to 9.1 Earths." Discovered in December 2011, the planet is also described as "a possible ocean world orbiting in the habitable zone, the region around a star where the temperature is right for liquid water, a requirement for life on Earth." Even traveling at the speed of light would take about 635 years to reach Kepler-22b from Earth, which confirms Zosia's claim that the planet is simply too distant.
