It is not known with certainty how planets are formed. The prevailing theory is that they coalesce during the collapse of a nebula into … See more

An exoplanet is a planet outside the Solar System. As of 24 July 2024, there are 7,026 confirmed exoplanets in 4,949 planetary systems, with 1007 systems having more than … See more

The idea of planets has evolved over the history of astronomy, from the divine lights of antiquity to the earthly objects of the scientific age. The … See more

The naming of planets differs between planets of the Solar System and exoplanets (planets of other planetary systems). Exoplanets are commonly named after their parent star and their order of discovery within its planetary system, such as See more

According to the IAU definition, there are eight planets in the Solar System, which are (in increasing distance from the Sun): Mercury, Venus, … See more

Although each planet has unique physical characteristics, a number of broad commonalities do exist among them. Some of these characteristics, such as rings or … See more

• Double planet – A binary system where two planetary-mass objects share an orbital axis external to both
• List of landings on extraterrestrial bodies
• Lists of planets – A list of lists of planets sorted by diverse attributes See more