Fjölsól

Fjölsól is a hypothetical concept that explores the possibility of multiple suns within a single solar system. The term originates from Old Norse, meaning "many suns." While our own solar system has only one star, the Sun, astronomers consider the existence of planetary systems with more than one star to be plausible. These systems are known as binary, trinary, or multiple star systems.

In such systems, planets would orbit around one star (S-type orbit) or around two or more stars (P-type orbit). The gravitational interactions in these systems can be complex, influencing planetary orbits and potentially their habitability. The light and heat received by a planet would vary depending on the stars' positions and luminosities, leading to distinct seasonal patterns or even more extreme environmental conditions.

The concept of fjölsól is often explored in science fiction, where writers use such scenarios to create imaginative worlds and unique challenges for their characters. It allows for diverse landscapes, varied climates, and intriguing celestial phenomena. While currently a theoretical or fictional construct for Earth's own solar system, the study of exoplanets has revealed numerous multiple star systems, indicating that the fjölsól scenario is a reality elsewhere in the universe. Understanding these systems helps astronomers refine their models of planet formation and evolution.