The star K2-138 is located at a distance of 792 light-years from our planet. It is colder than the Sun. Back in 2018, astronomers received data about the star using the Kepler orbiting telescope. Then they determined that five planets revolve around the star K2-138. It also turned out that the planets revolve around their star in concentric circles, forming a densely packed planetary system, unlike our elliptical and vast Solar System.
Recently, researchers again analyzed data on the star K2-138. As a result, they were able to record a sixth planet, the existence of which they did not suspect a few years ago.