A planetary system is a set of gravitationally bound non-stellar bodies in or out of orbit around a star or star system. Generally speaking, systems with...

bodies (such as moons, asteroids, comets) and planetary systems (in particular those of the Solar System) and the processes of their formation. It studies...

A planetary coordinate system (also referred to as planetographic, planetodetic, or planetocentric) is a generalization of the geographic, geodetic, and...

Understanding of the Origin of Planetary Systems". Strategy for the Detection and Study of Other Planetary Systems and Extrasolar Planetary Materials: 1990–2000...

Planetary nomenclature, like terrestrial nomenclature, is a system of uniquely identifying features on the surface of a planet or natural satellite so...

moonlets, or stellar objects. Ring systems are best known as planetary rings, common components of satellite systems around giant planets such as the rings...

Planetary geology, alternatively known as astrogeology or exogeology, is a planetary science discipline concerned with the geology of celestial bodies...

May 2025, there are 5,912 confirmed exoplanets in 4,409 planetary systems, with 993 systems having more than one planet. In collaboration with ground-based...

Planetary migration occurs when a planet or other body in orbit around a star interacts with a disk of gas or planetesimals, resulting in the alteration...

are mass and metallicity because they determine how these planetary systems form. Systems with higher mass and metallicity tend to have more planets...

nebular hypothesis of solar system formation describes how protoplanetary disks are thought to evolve into planetary systems. Electrostatic and gravitational...

A planetary-mass object (PMO), planemo, or planetary body (sometimes referred to as a world) is, by geophysical definition of celestial objects, any celestial...

term planetary candidate is used. Following the acceptance of the discovery paper, the Kepler team provided an additional moniker for the system of "Kepler-442"...

not known, planetary habitability is largely an extrapolation of conditions on Earth and the characteristics of the Sun and Solar System which appear...

stellar encounters. Such a scenario may mean that Proxima Centauri's planetary companions have had a much lower chance for orbital disruption by Alpha...

originate from planetary systems in which they are formed and later ejected, or they can also form on their own, outside a planetary system. The Milky Way...

star systems. Star systems are not to be confused with planetary systems, which include planets and similar bodies (such as comets). A star system of two...

peculiar planetary shapes have been depicted, including flattened, cubic, and toroidal. Some fictional planets exist in multiple-star systems where the...

The Planetary Data System (PDS) is a distributed data system that NASA uses to archive data collected by Solar System missions. The PDS is an active archive...

15". Space.com. Retrieved 9 January 2025. NASA Lunar and Planetary Science NASA Solar System Strategic Exploration Plans Soviet Lunar, Martian, Venusian...

to gravitational interactions. The process of planetary migration explains parts of the Solar System's current structure. In roughly 5 billion years,...

initially thought that a fourth planet in this system could not exist because it would have made the planetary system unstable and would have been ejected. But...

(/ˈɡliːzə/) is a red dwarf star of spectral type M3V which hosts a planetary system, 20.5 light-years (6.3 parsecs) away from Earth in the constellation...

(Online). n.d. "Gazetteer of Planetary Nomenclature". International Astronomical Union (IAU) Working Group for Planetary System Nomenclature (WGPSN). Retrieved...

System; planets outside of the solar system are also known as exoplanets. As of 30 May 2025, there are 5,912 confirmed exoplanets in 4,409 planetary systems...

Group for Planetary System Nomenclature (WGPSN), which maintains the astronomical naming conventions and planetary nomenclature for planetary bodies, and...

is home to the Gliese 581 planetary system, which consists of the star Gliese 581 and three confirmed planets. This system gained attention in the late...

that there are several stars lying within its borders that possess planetary systems. The two brightest stars, α Aquarii and β Aquarii, are luminous yellow...

planetary mass, including terrestrial planets (including Earth), dwarf planets, natural satellites, planetesimals and many other small Solar System bodies...

as a planetary system or an electron in an electromagnetic field. These systems can be studied in both Hamiltonian mechanics and dynamical systems theory...