Kepler90

Kepler-90 is a Sun-like star in the constellation Draco, located roughly 2,500 to 2,600 light-years from Earth. The star hosts one of the most populous exoplanetary systems known, with eight confirmed planets named Kepler-90b, Kepler-90c, Kepler-90d, Kepler-90e, Kepler-90f, Kepler-90g, Kepler-90h and Kepler-90i, detected by NASA's Kepler space telescope through transit observations.

The Kepler-90 system is notable for its compact architecture: all eight planets orbit the star at distances far smaller than those in our Solar System, forming a densely packed planetary configuration. The discovery highlighted the diversity of planetary system layouts and demonstrated that multiple-planet systems can include as many bodies as the Solar System within a relatively small region around their star. Confirmation of the planets involved analysis of Kepler light curves and, in some cases, transit timing variations that revealed gravitational interactions among neighboring planets.

Kepler-90 is considered solar-like in its basic properties, with a mass and temperature similar to those of the Sun. Studies of the system contribute to understanding planetary formation, orbital resonances, and the long-term dynamical stability of densely packed planetary systems observed by Kepler and other surveys. The Kepler-90 system remains a key reference in comparative exoplanetology for exploring how common or rare such crowded configurations are in the galaxy.