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Last update: October 2, 2025

The largest objects in the solar system

The largest objects in the solar system

Ganymede is the largest natural satellite of Jupiter and also the largest natural satellite in the solar system. With a diameter of about 5262 kilometers it is the largest object after the Sun and the planets. It was discovered by Galileo in 1610 and is named after the Greek mythological character Ganymede, who was a handsome young man abducted by Zeus to become the divine cup of Olympus.

Table of solar system objects classified by size

The solar system is the name given to the planetary system made up of the Sun and the celestial objects orbiting around it. Our solar system has only one star, the Sun. However astronomers have observed that multiple solar systems, with two, three or more stars, are numerous. Without competition, the Sun has become gigantic, it has captured 99.86% of the total mass of dust and gas from the original nebula. Jupiter, the largest planet in the system, captured 71% of the remainder. The other planets have shared the residue of this gravitational evolution.

Definition of planet

“A planet is a celestial body which is in orbit around the Sun, which has sufficient mass for its gravity to overcome the cohesive forces of the solid body and maintain it in hydrostatic equilibrium (spherical shape), and which has eliminated any body moving in a near orbit”.

This definition was approved on August 24, 2006, during the 26th General Assembly of the UAI by a show of hands of 400 scientists after ten days of discussions.

Objets du Système solaire - tailles comparées
ObjetsCaractéristiqueDiamètre moyenRapport/Terre
SoleilÉtoile1 392 000 km109.125
JupiterPlanète142 984 km11.208
SaturnePlanète120 536 km9.449
UranusPlanète51 118 km4.007
NeptunePlanète49 528 km3.882
TerrePlanète12 756 km1
VénusPlanète12 102 km0.949
MarsPlanète6 796 km0.532
GanymèdeLune de Jupiter5 268 km0.413
TitanLune de Saturne5 152 km0.404
MercurePlanète4 880 km0.382
CallistoLune de Saturne4 820 km0.378
IoLune de Jupiter3 660 km0.286
LuneLune de la Terre3 474 km0.273
EuropeLune de Jupiter3 120 km0.245
TritonLune de Neptune2 706 km0.212
ÉrisPlanète naine2 326 km0.364
PlutonPlanète naine2 306 km0.187
MakemakePlanète naine≈ 1 600 km0.250
TitaniaLune d'Uranus1 577 km0.123
RhéaLune de Saturne1 528 km0.119
ObéronLune d'Uranus1 523 km0.119
JapetLune de Saturne1 469 km0.115
CharonPlanète naine1 206 km0.095
UmbrielLune d'Uranus1 169 km0.092
ArielLune d'Uranus1 158 km0.090
DionéLune de Saturne1 123 km0.088
TéthysLune de Saturne1 062 km0.083
CérèsPlanète naine974 km0.076
VestaAstéroïde≈ 525 km0.041
EnceladeLune de Saturne≈ 504 km0.039
MirandaLune d'Uranus≈ 471 km0.036
ProtéeLune de Neptune≈ 420 km0.033
MimasLune de Saturne≈ 396 km0.031
HypérionLune de Saturne≈ 270 km0.021
PhœbéLune de Saturne≈ 212 km0.017
JanusLune de Saturne≈ 180 km0.014
AmalthéeLune de Jupiter≈ 167 km0.013
ÉpiméthéeLune de Saturne≈ 167 km0.013
ProméthéeLune de Neptune≈ 116 km0.009
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To explore in this category

Do Natural Satellites of Natural Satellites Exist?
Phobos and Deimos: An Orbital Dynamics Under High Gravitational Stress
The Moons of Jupiter: A Celestial Archipelago of over 100 Different Worlds
Saturn's Moons: Worlds That Could Harbor Microbial Life
The moons of Uranus: A strange tilted celestial ensemble
Triton and the Moons of Neptune: The Mystery of the Captive Moon
If the Moon Did Not Exist: Impacts on Earth and Life
The Far Side of the Moon: The Hidden Half Revealed
Tidal Effects in the Solar System
Moons in the Shadow: Jupiter's Most Discreet Satellites
Moon Phases
Apollo 8: The Photo That Shook the World
The largest objects in the solar system
The Giant Impact: How Our Moon Came to Be
Phobos Facing Its Destiny: Collision or Breakup
Europa: An Icy Jewel in Jupiter's Orbit
Io: Jupiter's Moon in Perpetual Eruption
Iapetus, Saturn's two-faced moon: between shadow and light
Dione: Saturn's Icy Moon with Buried Secrets and Frozen Landscapes
Mimas: Saturn's Moon with a Giant Crater
The Origins of the Moon: From Chaos to Formation
Pluto's Satellites: Strange Companions in the Shadow of the Dwarf Planet
Craters of the Moon: Witnesses of the Solar System's History
Hyperion, moon of Saturn
Eclipses explained by the plane of the lunar orbit
Titan and Dione: Saturn's Icy Sisters
Enceladus: The Ocean Hidden Beneath the Ice
Amalthea: A Dusty Red World at the Heart of Jupiter's Rings
Deimos: The Small, Smooth, Bumpy, and Heavily Cratered Object
Moon Illusion
Rhea and Saturn’s Rings: Orbital Dynamics
Helen, the small Trojan moon of Saturn
Titania: What space probes have revealed about Uranus's moon
The Blue Moon
Phobos: The Fascinating Descent to Mars
Charon: An Inseparable Duo with Pluto
Roche Limit or Roche Radius
When the Moon Becomes Giant: The Supermoon Phenomenon
The Satellite Worlds of the Solar System: Hidden Oceans, Ice Volcanoes, and Fleeting Atmospheres
Ganymede: The Icy World of Many Records
Tethys, Saturn's Moon: Ithaca Chasma, Frozen Ocean and Fractured Crust
Titan: A Hazy World Favorable to Prebiotic Life?
The Dance of Prometheus: Between Shadow and Light
Triton: Neptune's Rebellious Moon – Between Gravitational Capture and Active Cryovolcanism
Miranda: Uranus' Moon of a Thousand Scars
Mascons: Lunar Gravitational Anomalies