bolygójuk

Bolygojuk is a term used in astronomy to refer to a planet. The word is of Hungarian origin, meaning "their planet" or "their world." In a broader context, it can be used to describe any celestial body that orbits a star and has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, and has cleared the neighborhood around its orbit.

The concept of planets, or bolygójuk, has evolved significantly throughout history. Ancient astronomers, observing the night sky, identified certain celestial bodies that moved differently from the fixed stars. These wandering stars were given names and were often associated with deities. The understanding of what constitutes a planet was largely geocentric until the Copernican revolution, which proposed a heliocentric model of the solar system.

Modern astronomy classifies bolygójuk into different categories. Terrestrial planets, like Earth and Mars, are characterized by their rocky surfaces. Gas giants, such as Jupiter and Saturn, are composed primarily of gases. Ice giants, like Uranus and Neptune, are a mix of rock, ice, and gas. The discovery of exoplanets, planets orbiting stars outside our solar system, has further expanded our understanding of bolygójuk and the potential for life beyond Earth. The study of bolygójuk is a fundamental aspect of astrophysics and astrobiology, aiming to understand planetary formation, evolution, and the conditions necessary for life.