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Set of non-stellar objects in orbit around a star
A planetary system consists of a set of non-stellar bodies which are gravitationally bound to and in orbit of a star or star system. Generally speaking
Planetary_system
Planetary system consisting of the Sun and objects orbiting it
The Solar System is an isolated single-star planetary system (not part of a larger star system) within the Milky Way Galaxy. The system formed about
Solar_System
Science of planets and planetary systems
(including Earth), moons, asteroids, comets) and planetary systems (in particular those of the Solar System) and the processes of their formation. It studies
Planetary_science
Coordinate system for planets
A planetary coordinate system (also referred to as planetographic, planetodetic, or planetocentric) is a generalization of the geographic, geodetic, and
Planetary_coordinate_system
Planet outside of the Solar System
July 2026, there are 6,333 confirmed exoplanets in 4,740 planetary systems, with 1,056 systems having more than one planet. There are many methods of detecting
Exoplanet
Ring of cosmic dust orbiting an astronomical object
moonlets, or stellar objects. Ring systems are best known as planetary rings, common components of satellite systems around giant planets such as the rings
Ring_system
System of uniquely identifying features on the surface of a planet or natural satellite
Planetary nomenclature, like terrestrial nomenclature, is a system of uniquely identifying features on the surface of a planet or natural satellite so
Planetary_nomenclature
Gas and dust surrounding a newly formed star
nebular hypothesis of solar system formation describes how protoplanetary disks are thought to evolve into planetary systems. Electrostatic and gravitational
Protoplanetary_disk
K-type main sequence star in the constellation Lyra
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"
Kepler-442
Nearest star to the Solar System
Alejandro; Artigau, Étienne; et al. (29 July 2025). "Diving into the planetary system of Proxima with NIRPS: Breaking the metre per second barrier in the
Proxima_Centauri
Geological study of planets
Planetary geology, alternatively known as astrogeology or exogeology, is a planetary science discipline concerned with the geology of celestial bodies
Planetary_geology
Planet not gravitationally bound to a star
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
Rogue_planet
Known extent to which a planet is suitable for life
not known, planetary habitability is largely an extrapolation of conditions on Earth and the characteristics of the Sun and Solar System which appear
Planetary_habitability
List of systems with multiple planets
are mass and metallicity because they determine how these planetary systems form. Systems with higher mass and metallicity tend to have more planets
List of multiplanetary systems
List_of_multiplanetary_systems
planetary mass, including terrestrial planets (including Earth), dwarf planets, natural satellites, planetesimals and many other small Solar System bodies
Planetary_surface
Small number of stars that orbit each other
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
Star_system
2019 video game
as they explore a planetary system stuck in a 22-minute time loop that resets after the sun goes supernova and destroys the system. Through repeated attempts
Outer_Wilds
Size-based definition of celestial objects
A planetary-mass object (PMO), planemo, or planetary body (sometimes referred to as a world) is, by geophysical definition of celestial objects, any celestial
Planetary-mass_object
Association of professional astronomers
Group for Planetary System Nomenclature (WGPSN), which maintains the astronomical naming conventions and planetary nomenclature for planetary bodies, and
International Astronomical Union
International_Astronomical_Union
G-type main-sequence star in the constellation Cygnus
candidate, it was given the Kepler object of interest number of KOI-7016. Planetary candidates were detected around the star by NASA's Kepler Mission, a mission
Kepler-452
List of largest planets by size
(February 2023). "Peering into the young planetary system AB Pic: Atmosphere, orbit, obliquity, and second planetary candidate". Astronomy & Astrophysics
List_of_largest_exoplanets
Data archive for NASA solar system missions
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
Planetary_Data_System
peculiar planetary shapes have been depicted, including flattened, cubic, and toroidal. Some fictional planets exist in multiple-star systems where the
Extrasolar_planets_in_fiction
System; planets outside of the solar system are also known as exoplanets. As of 30 July 2026, there are 6,333 confirmed exoplanets in 4,740 planetary
Lists_of_planets
Star in the constellation Libra
(/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
Gliese_581
to gravitational interactions. The process of planetary migration explains parts of the Solar System's current structure. In roughly five billion years
Formation and evolution of the Solar System
Formation_and_evolution_of_the_Solar_System
Astronomical phenomenon
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
Planetary_migration
Hypothesis that complex extraterrestrial life is improbable and extremely rare
among others, argued that Earth is a typical rocky planet in a typical planetary system, located in a non-exceptional region of a common galaxy, now known
Rare_Earth_hypothesis
Zodiac constellation in the southern celestial hemisphere
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
Libra_(constellation)
Red dwarf star in the constellation Aquarius
project), which discovered the first two exoplanets around the star. Its planetary system was discovered by a team led by Michaël Gillon, a Belgian astronomer
TRAPPIST-1
Zodiac constellation straddling the celestial equator
that there are several stars lying within its borders that possess planetary systems. Aquarius is characterized by a Y-shaped asterism historically called
Aquarius_(constellation)
Dynamical system governed by Hamilton's equations
as a planetary system or an electron in an electromagnetic field. These systems can be studied in both Hamiltonian mechanics and dynamical systems theory
Hamiltonian_system
Earth-size exoplanet orbiting TRAPPIST-1
planets in the Solar System. In November 2018, researchers determined that of the seven exoplanets in the multi-planetary system, TRAPPIST-1e has the
TRAPPIST-1e
Binary star with at least five exoplanets 41 light-years away
Greenberg, Lunar and Planetary Lab, University of Arizona The First and the second part of a computer animation of the 55 Cancri planetary system. Interactive
55_Cancri
Habitability of the celestial bodies of the Solar System
Planetary habitability in the Solar System is the study that searches the possible existence of past or present extraterrestrial life in those celestial
Planetary habitability in the Solar System
Planetary_habitability_in_the_Solar_System
Star with six sub-Neptune sized planets in the constellation Coma Berenices
related planetary system, is located 105 light-years away in the constellation Coma Berenices. HD 110067 is part of a wide triple star system, along with
HD_110067
Type of exoplanet larger than Earth
announced the discovery of two new super-Earths within the Gliese 581 planetary system, both on the edge of the habitable zone around the star where liquid
Super-Earth
Star system in the Centaurus constellation
from comets. In the α Centauri system, Proxima Centauri may have influenced the planetary disk as the α Centauri system was forming, enriching the area
Alpha_Centauri
Planets found orbiting pulsars
rise to planets. There are several processes that could give rise to planetary systems: "First-generation" planets are planets that orbited the star before
Pulsar_planet
Star in the constellation Draco, orbited by eight planets
notable for being the only confirmed planetary system with the same number of observed planets as the Solar System. Prior to Kepler observation, Kepler-90
Kepler-90
Life that does not originate on Earth
ubiquitous in the cosmos and not a rarity from the Solar System. The Solar System is a planetary system and is part of the Milky Way galaxy. The Milky Way is
Extraterrestrial_life
Stellar core remnant
that a white dwarf has a remnant planetary system. The most common observable evidence of a remnant planetary system is pollution of the spectrum of a
White_dwarf
Brightest star in the constellation Lyra
planetary system cannot yet be ruled out. Thus there could be smaller, terrestrial planets orbiting closer to the star. The inclination of planetary orbits
Vega
Triple star system in the constellation Eridanus
to be caused by a planetary companion. The 42-day period is close to the stellar rotation period, which made the possible planetary nature of the signal
40_Eridani
Regular and periodic mutual gravitational influence of orbiting bodies
1:1 resonance between bodies with similar orbital radii causes large planetary system bodies to eject most other bodies sharing their orbits; this is part
Orbital_resonance
System-like planetary systems? (Some observed planetary systems contain Super-Earths and Hot Jupiters that orbit very close to their stars. Systems with
List of unsolved problems in astronomy
List_of_unsolved_problems_in_astronomy
Triple star system in the constellation of Lyra
close to their star to harbour life forms. Preliminary results of the planetary system around Kepler-444 were first announced at the second Kepler Science
Kepler-444
Methods to prevent destructive asteroid hits
Group, NASA Office of Space Science, Solar System Exploration Office. France, Martin (7 August 2000). "Planetary Defense: Eliminating the Giggle Factor"
Asteroid_impact_avoidance
Star in the constellation Andromeda
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
Upsilon_Andromedae
Innermost layer(s) of a planet
A planetary core consists of the innermost layers of a planet. Cores may be entirely liquid, or a mixture of solid and liquid layers as is the case in
Planetary_core
Hypothesis on the interstellar spreading of primordial life
Solar System bodies that harbor life. This debris containing the lifeforms is then transported by meteors between bodies in a planetary system, or even
Panspermia
Single yellow-hued star in the constellation Cetus
Integrated Analysis with Predictions on the Architecture of the tau Ceti Planetary System, Including a Habitable Zone Planet". The Astronomical Journal. 161
Tau_Ceti
Yeomans, Donald K. (13 July 2006). "Planetary Satellite Physical Parameters". JPL Solar System Dynamics. Planetary Satellite Physical Parameters Moon Fact
List of Solar System objects by size
List_of_Solar_System_objects_by_size
Star in the constellation Cetus
MEarth Project Planetary habitability High Accuracy Radial Velocity Planet Searcher (HARPS) Super-Earth Habitability of red dwarf systems GJ 1132 b GJ 1214
LHS_1140
Body of interstellar clouds
The remaining material is then thought to form planets and other planetary system objects. Most nebulae are of vast size; some are hundreds of light-years
Nebula
Constellation in the northern celestial hemisphere
doi:10.1086/521866. S2CID 18286425. Cochran, W.; et al. (2007). "A Planetary System Around HD 155358: The Lowest Metallicity Planet Host Star". The Astrophysical
Hercules_(constellation)
Small planetary-mass object
likeliest dwarf planets and dates of discovery A dwarf planet is a small planetary-mass object that is in direct orbit around the Sun, massive enough to
Dwarf_planet
Elements of some cosmological models
below. When scholars applied Ptolemy's epicycles, they presumed that each planetary sphere was exactly thick enough to accommodate them. By combining this
Celestial_spheres
Apparent alignment of planets in the night sky
astronomy, a planetary parade, also known as a planetary alignment or planetary procession, occurs when multiple planets in the Solar System are visible
Planetary_parade
Millisecond pulsar in the constellation Sculptor
in 2017. The system is one of the few known examples of a pulsar with a surviving planetary companion, offering insights into planetary formation and
PSR_J2322−2650
Astronomical theory about the Solar System
formation and evolution of the Solar System (as well as other planetary systems). It suggests the Solar System was formed from gas and dust orbiting
Nebular_hypothesis
been confirmed to have planetary systems; 51 stars in this range are visible to the naked eye, eight of which have planetary systems. The first report of
List_of_nearest_exoplanets
Type of emission nebula created by dying red giants
A planetary nebula is a type of emission nebula consisting of an expanding, glowing shell of ionized gas ejected from red giant stars late in their lives
Planetary_nebula
Constellation in the southern celestial hemisphere
July 1, 2003, a planet was found orbiting the star HD 70642. This planetary system is much like Jupiter with a wide, circular orbit and a long-period
Puppis
Star in the constellation Canis Minor
"GJ 273: On the formation, dynamical evolution, and habitability of a planetary system hosted by an M dwarf at 3.75 parsec". Astronomy & Astrophysics. 641:
Luyten's_Star
Star in the constellation Piscis Austrinus
"UBVRIJKL photometry of the bright stars". Communications of the Lunar and Planetary Laboratory. 4 (99): 99. Bibcode:1966CoLPL...4...99J. Mamajek, E.E. (August
TW_Piscis_Austrini
Natural physical entity in space
with substructures. Some examples of astronomical objects include planetary systems, star clusters, nebulae, and galaxies, while asteroids, moons, planets
Astronomical_object
wind". www.esa.int. Retrieved 28 May 2026. NASA Lunar and Planetary Science NASA Solar System Strategic Exploration Plans Soviet Lunar, Martian, Venusian
Timeline of Solar System exploration
Timeline_of_Solar_System_exploration
Star in the constellation Pegasus
three of the planets in the Gliese 876 system). According to dynamical simulations, the HR 8799 planetary system may be in an 1:2:4:8 resonance. The broadband
HR_8799
Short-term state of the atmosphere
planetary bodies. A star's corona is constantly being lost to space, creating what is essentially a very thin atmosphere throughout the Solar System.
Weather
Star in the constellation Musca
planetary mass and radius of 25 MJup and 3.4 RJup, making it still one of the largest exoplanets discovered by size. In April 2003, another planetary
HD_100546
Star in the constellation Gemini
(2006-07-07). "Precise Radial Velocities of Giant Stars II. Pollux and its Planetary Companion". Astrophys. J. 652 (1): 661–665. arXiv:astro-ph/0607136. Bibcode:2006ApJ
Pollux_(star)
Triple star system in the constellation Piscis Austrinus
object, or a planetary companion to Fomalhaut. In December of 2025, another major collision was reported to have occurred in the Fomalhaut system, noted to
Fomalhaut
Moon beyond the Solar System
S.; et al. (24 July 2018). "MOA-2015-BLG-337: A Planetary System with a Low-mass Brown Dwarf/Planetary Boundary Host, or a Brown Dwarf Binary". The Astronomical
Exomoon
Star in the constellation Hydrus
in the southern constellation Hydrus that is notable for its large planetary system. Since its discovery, at least six exoplanets have been observed orbiting
HD_10180
Sun-centered astronomical model
the remaining truth value of the term, narrowed to the scope of our planetary system. While the sphericity of Earth was widely recognized in Greco-Roman
Heliocentrism
Hierarchical triple star system in the constellation Pisces
"Catalogue of Exoplanets". exoplanet.eu. Retrieved 2024-06-20. "Planetary Systems Composite Data". NASA Exoplanet Archive. Retrieved 25 June 2024. "GJ
Gliese_900
Star in the constellation Cassiopeia
Renu (2022). "An Integrative Analysis of the HD 219134 Planetary System and the Inner solar system: Extending DYNAMITE with Enhanced Orbital Dynamical Stability
HD_219134
Curved path of an object around a point
summarised in his three laws of planetary motion. First, he found that the orbits of the planets in the Solar System are elliptical, not circular (or
Orbit
Red dwarf star in the constellation Leo
K2-18, also known as EPIC 201912552, is a red dwarf star with two planetary companions located 124 light-years (38 parsecs) from Earth, in the constellation
K2-18
Sun-like star in the constellation Cygnus
inclinations of the planetary orbits are about 1°, meaning the system is probably more coplanar (flatter) than the Solar System, where the corresponding
Kepler-11
of detecting exoplanets List of potentially habitable exoplanets "Planetary Systems Composite Data". NASA Exoplanet Archive. Retrieved 12 December 2021
List_of_exoplanet_extremes
Planet that is outside the Milky Way galaxy
host two super-Jupiter planets or brown dwarfs, although the claimed planetary system is not dynamically stable. As BD+20 2457 is a halo star possibly having
Extragalactic_planet
Red dwarf star in the constellation Ophiuchus
Star hosts a system of four close-orbiting, sub-Earth-mass planets (Barnard's Star b, c, d & e). Multiple claims for a planetary system had been proposed
Barnard's_Star
Star in the constellation Eridanus
planet 'c'. According to the Planetary Habitability Laboratory (PHL) in Puerto Rico, both b and c worlds in the system may be classifiable as potentially
Gliese_180
Space exploration concept
be sent out to other planetary systems. The original "parent" probe could then pursue its primary purpose within the star system. This mission varies
Self-replicating_spacecraft
Changes to stars over their lifespans
may gain a protoplanetary disk, which furthermore can develop into a planetary system. Eventually the star's core exhausts its supply of hydrogen and the
Stellar_evolution
German aerospace company
Planetary Transportation Systems (PTS), formerly known as PTScientists and Part-Time Scientists, is a Berlin-based aerospace company. They developed the
Planetary Transportation Systems
Planetary_Transportation_Systems
Systematic designations to unambiguously identify astronomical objects
Circulars and the Kometnyj Tsirkular use them. The planetary system around the Sun is called Solar System, using the Latin name of the Sun. In science fiction
Astronomical naming conventions
Astronomical_naming_conventions
Circumbinary exoplanet orbiting TOI-1338
(400 parsecs) from Earth. It is the innermost planet of the TOI-1338 planetary system, orbiting the stars' center of mass every 95 days at an average distance
TOI-1338_b
Astrogeological concept
In planetary science, planetary differentiation is the process by which the chemical elements of a planetary body accumulate in different areas of that
Planetary_differentiation
Hypothesis about Solar System planets' orbits
is a formulaic prediction of spacing between planets in any given planetary system. The formula suggests that, extending outward, each planet should be
Titius–Bode_law
Second brightest star in the southern constellation of Pictor
core. In 2011 the disk around Beta Pictoris became the first other planetary system to be photographed by an amateur astronomer. Rolf Olsen of New Zealand
Beta_Pictoris
Millisecond pulsar in the constellation Virgo
Lich, after a powerful, fictional undead creature. The pulsar has a planetary system with three known pulsar planets, named "Draugr" (PSR B1257+12 b or
PSR_B1257+12
K-type star in the constellation Lyra
Kepler-62f) of the Kepler-62 system was predicted, but no such planet has been detected. To keep this planetary system, which is highly sensitive to
Kepler-62
planetary system Any set of gravitationally bound non-stellar objects in or out of orbit around a star or star system. In general, planetary systems include
Glossary_of_astronomy
Infrared space observatory
stars with disks of dust around them, possibly the early stage of planetary system formation. New discoveries included a dust disk around Vega and the
IRAS
Subdwarf star with spectral type B
*eclipsing binary star There are at least four sdB stars which may possess planetary systems. However in three of four cases, subsequent research has indicated
Subdwarf_B_star
Triple-star system in the constellation Scorpius
O'Toole, Simon J.; Jones, Hugh R. A.; Jenkins, James S. (2012). "A Planetary System around the nearby M Dwarf GJ 667C with At Least One Super-Earth in
Gliese_667
Hot Super-Earth orbiting 55 Cancri A
predating Gliese 876 d by a year. It is the innermost planet in its planetary system, taking less than 18 hours to complete an orbit. However, until the
55_Cancri_Ae
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