exoplanetssystem
An exoplanetssystem is a star and its gravitationally bound planetary companions, together with any moons or belts of debris that orbit it. Exoplanetssystem display a wide range of architectures: some host only a single planet, while others contain multiple planets in compact, coplanar orbits. They can include hot Jupiters close to the star, tightly packed multi-planet systems, and planets on highly eccentric orbits. The diversity informs models of planet formation and migration.
Formation and dynamics: Most systems are believed to form from a protoplanetary disk around a young star.
Detection and study: Exoplanets are detected by transit (dips in starlight), radial velocity (wobbles of the
Habitability and notable examples: The habitable zone is the region where liquid water could persist, and some