Risa is an M-class planet in the binary system and has two moons. It is the home world of a very advanced species of Risans and is a member of the United Federation of Planets. As early as the 22nd century, before the Federation was established, it was known as a great place for recreation for many space-traveling species. Thanks to its technologically advanced inhabitants, it turned it from a very rainy and geologically active planet through a network of weather control stations and seismic regulators into a pleasant, subtropical paradise on earth. The pleasant stay of visitors is enhanced by the Risans themselves, who are an extremely hospitable kind. The planet is considered one of the most beautiful planets in the galaxy.