Jättiläisplaneetat

Jättiläisplaneetat, known in English as gas giants or Jovian planets, are planets in a solar system that are composed primarily of hydrogen and helium. They are significantly larger and more massive than terrestrial planets. Our own solar system has four such planets: Jupiter, Saturn, Uranus, and Neptune. Jupiter and Saturn are the largest, with their masses being hundreds of times that of Earth. Uranus and Neptune are considerably smaller but still vastly larger than terrestrial planets.

These planets are characterized by their lack of a solid surface, instead possessing a dense atmosphere that gradually transitions into a liquid or metallic interior under immense pressure. They often have extensive systems of moons and rings. Jupiter's Great Red Spot is a famous example of a long-lasting storm system in its atmosphere. Saturn's prominent rings are composed of ice particles and rocky debris.

The formation of jättiläisplaneetat is thought to occur further from the star in a solar system, where temperatures are low enough for gases like hydrogen and helium to condense and accumulate around a solid core. Their immense gravitational pull influences the orbits of other celestial bodies in their system. Studies of jättiläisplaneetat provide crucial insights into planetary formation and the diversity of planets beyond our own.