The Sun dominates the system
The Sun supplies almost all of the light and heat experienced by the planets and its gravity controls the large-scale architecture of the planetary system.
Whiteheart9 · Solar System
Our Solar System
One star. Eight planets. Dwarf worlds, moons, asteroids, comets and spacecraft — all moving through a vast planetary neighbourhood that extends far beyond the familiar planets.
1StarThe Sun
8PlanetsMercury → Neptune
5Recognized dwarf planetsIncluding Pluto & Ceres
4.6BYears oldApproximate age of the system
The Neighbourhood
What is the Solar System?
The Solar System is the Sun and everything gravitationally bound to it: planets, dwarf planets, moons, asteroids, comets, dust and enormous populations of smaller bodies.
Planets are only part of it
Beyond the eight planets are moons, asteroid populations, comets, dwarf planets and distant reservoirs of icy bodies.
The boundary is enormous
The Solar System extends far beyond Neptune. The Kuiper Belt lies beyond Neptune, while the Oort Cloud is thought to form a much more distant spherical shell around the system.
NASA Interactive
Explore the Solar System in 3D
NASA's Eyes on the Solar System uses mission data and imagery to create an interactive simulated view of planets, moons, asteroids, comets and spacecraft. You can move through time and explore missions across the Solar System.
NASA Eyes on the Solar System
Interactive 3D exploration · external NASA application
NASA visualization
If the interactive does not load on your device,
open NASA Eyes on the Solar System directly ↗.
Our Star
The Sun: the engine of our planetary system
The Sun is a star at the centre of our system. Its gravity keeps the planets and smaller bodies in orbit, while its radiation drives much of the space environment around Earth.
Solar wind
Streams of charged particles flow outward from the Sun and interact with planetary magnetic fields and atmospheres.
Solar activity
Flares and coronal mass ejections can send bursts of energy and plasma through interplanetary space.
The Eight Planets
Meet the worlds orbiting our star
The first four planets are rocky terrestrial worlds. Jupiter and Saturn are gas giants; Uranus and Neptune are ice giants.
01 · Terrestrial
Mercury
The smallest planet and the one closest to the Sun. Its heavily cratered surface records a long history of impacts.
02 · Terrestrial
Venus
A rocky planet wrapped in a dense atmosphere. Its powerful greenhouse effect makes its surface extraordinarily hot.
03 · Terrestrial
Earth
Our home world, with liquid surface oceans, a nitrogen-rich atmosphere and the only confirmed life known so far.
04 · Terrestrial
Mars
A cold desert world with volcanoes, canyons, polar ice and abundant evidence that water once shaped its surface.
05 · Gas giant
Jupiter
The largest planet in the Solar System, famous for its immense storms, powerful magnetic environment and many moons.
06 · Gas giant
Saturn
The second-largest planet and one of the most recognizable worlds, surrounded by an immense and complex ring system.
07 · Ice giant
Uranus
A pale blue-green ice giant rotating with a dramatic axial tilt, giving it unusually extreme seasonal geometry.
08 · Ice giant
Neptune
The most distant recognized planet, with deep blue coloration, dynamic weather and some of the fastest winds known on a planet.
Real imagery: The eight planet globes above use photographic NASA/JPL imagery; the motion effects are a visual layer added by Whiteheart9, not a claim that these images are live spacecraft feeds.
Scale warning: This page uses visual sizes and spacing for readability. A true-to-scale
Solar System would make the distances between planets enormous compared with the size of the worlds.
Two Planetary Families
Rocky worlds and giant worlds
Inner planets · Mercury, Venus, Earth, Mars
These terrestrial planets have solid surfaces and are relatively small compared with the giant planets. Their compositions and histories differ, but all formed in the hotter inner region of the young Solar System.
Outer planets · Jupiter, Saturn, Uranus, Neptune
The outer planets are giant worlds. Jupiter and Saturn are gas giants, while Uranus and Neptune are classified as ice giants because of their different bulk compositions.
At a Glance
Compare the eight planets
Useful broad comparisons — not a substitute for the full NASA datasets.
| Planet | Type | Distance from Sun* | Year | Moons** |
|---|---|---|---|---|
| Mercury | Terrestrial | 57.9 million km | 88 days | 0 |
| Venus | Terrestrial | 108.2 million km | 224.7 days | 0 |
| Earth | Terrestrial | 149.6 million km | 365.25 days | 1 |
| Mars | Terrestrial | 227.9 million km | 687 days | 2 |
| Jupiter | Gas giant | 778.5 million km | 11.86 years | Many |
| Saturn | Gas giant | 1.43 billion km | 29.45 years | Many |
| Uranus | Ice giant | 2.87 billion km | 84 years | Many |
| Neptune | Ice giant | 4.50 billion km | 164.8 years | Many |
*Approximate mean distance. **Moon counts can change as new satellites are confirmed.
Worlds Beyond the Eight
Dwarf planets
NASA currently identifies five officially recognized dwarf planets in our Solar System: Ceres, Pluto, Haumea, Makemake and Eris.
Ceres
The largest object in the asteroid belt and the only officially recognized dwarf planet in the inner Solar System.
Pluto
A complex Kuiper Belt dwarf planet visited by New Horizons in 2015, revealing mountains, plains and a striking heart-shaped region.
Haumea
An unusual, rapidly rotating dwarf planet with an elongated shape and a ring.
Makemake
A bright Kuiper Belt dwarf planet discovered beyond Neptune.
Eris
A distant dwarf planet whose discovery helped drive the debate that led to the modern planetary classification.
Possible Planet Nine
A hypothetical distant planet has been proposed to explain patterns in some distant orbits, but no direct evidence of such a planet has been found.
Beyond Neptune
The Solar System does not end at Neptune
The planetary region is only the beginning of the Solar System's outer architecture.
☄ The Kuiper Belt
A broad, doughnut-shaped region of icy bodies beyond Neptune. Pluto and Arrokoth are among the objects associated with this distant population. New Horizons visited Pluto in 2015 and Arrokoth in 2019.
◌ The Oort Cloud
A theoretical, extremely distant spherical shell of icy bodies thought to surround the Solar System. It has not been directly imaged because of its enormous distance.
Where is the edge?
There is no single simple boundary. Different definitions use different physical markers,
including the region dominated by the Sun's gravity, the heliosphere, the Kuiper Belt and the
much more distant Oort Cloud.
The Solar System in Motion
Phenomena worth watching
Our planetary neighbourhood is dynamic — not a collection of motionless spheres.
Auroras
Charged particles interacting with a planetary atmosphere can produce glowing auroral displays.
Eclipses
When one celestial body passes into the shadow of another, spectacular alignments can occur.
Comets
Icy bodies can develop glowing comae and tails when sunlight heats material near the Sun.
Planetary storms
Giant atmospheres can produce enormous storms and weather systems that dwarf terrestrial examples.
Worlds Around Worlds
The moons may be just as fascinating
Some moons are small rocky remnants; others have atmospheres, ice shells, volcanoes, underground oceans or environments that could be important in the search for habitable conditions.
Europa
Jupiter's icy moon is thought to have a global ocean beneath its ice shell and is a major target for exploration.
Enceladus
Saturn's small icy moon ejects plumes of material from its south polar region, revealing an active interior.
Titan
Saturn's largest moon has a thick atmosphere and surface lakes and seas of liquid hydrocarbons.
Io
Jupiter's volcanic moon is the most volcanically active world known in the Solar System.
4.6 Billion Years Ago
How the Solar System formed
Cloud collapses
A cloud of gas and dust collapsed under gravity, forming a dense young Sun at its centre.
Disk forms
Conservation of angular momentum produced a rotating disk of material around the young star.
Planetesimals grow
Dust and rock collided and accumulated into larger bodies, eventually producing protoplanets.
Planets evolve
Gravity, impacts, chemistry and internal processes shaped the worlds we see today.
Humanity's Robotic Eyes
We have sent machines across the neighbourhood
Spacecraft have visited every planet in the Solar System, while missions continue to investigate asteroids, comets, moons and the distant outer system.
Jupiter
Juno
Mission: Studies Jupiter's atmosphere, magnetic field, gravity and interior.
Saturn
Cassini–Huygens
Legacy: Transformed our understanding of Saturn, its rings and moons, including Titan and Enceladus.
Pluto / Kuiper Belt
New Horizons
Milestones: First close-up exploration of Pluto and later the Kuiper Belt object Arrokoth.
Interstellar
Voyager 1 & 2
Legacy: Flew past the outer planets and continue to send information from the distant heliosphere/interstellar region.
Asteroid
OSIRIS-REx
Milestone: Collected a sample from asteroid Bennu and returned it to Earth for laboratory study.
Mars
Curiosity & Perseverance
Role: Investigate Martian geology, climate history and the ancient environments that may once have been habitable.
Asteroid
Psyche
Goal: Travel to the metal-rich asteroid Psyche to investigate a world unlike the rocky planets we have explored.
Jupiter system
Europa Clipper
Goal: Study Europa's ice shell, surface and environment to investigate whether the moon could support conditions suitable for life.
Mercury
BepiColombo
Goal: Study Mercury's surface, interior, magnetic environment and interaction with the solar wind.
Exploration Timeline
From first flybys to planetary laboratories
A selection of milestones that changed our view of the Solar System.
1962
Mariner 2 reaches Venus
The first successful interplanetary mission sends scientific data from another planet back to Earth.
1977
Voyager launches
The twin spacecraft begin a journey that will transform knowledge of the outer planets.
1989
Voyager 2 reaches Neptune
Humanity completes its first close exploration of all four giant planets.
1997–2017
Cassini explores Saturn
More than a decade of observations reveal extraordinary detail about Saturn, its rings and moons.
2015
New Horizons reaches Pluto
The spacecraft returns the first close-up images of Pluto and reveals an unexpectedly active world.
2019
Arrokoth flyby
New Horizons explores a Kuiper Belt object at the most distant planetary flyby yet achieved.
2020
OSIRIS-REx samples Bennu
A spacecraft collects material from an asteroid and later returns the sample to Earth.
2024+
A new era of exploration
Missions including Europa Clipper and Psyche expand the range of worlds we can study directly.
Perspective
How small is our planetary neighbourhood?
The Solar System feels enormous from Earth. On the scale of the Milky Way, however, it is only one tiny planetary system orbiting one star among hundreds of billions.
Earth → Sun
Light from the Sun takes about 8 minutes and 20 seconds to reach Earth.
Earth → Neptune
The outer planets are so distant that light and spacecraft require significant travel time to cross the system.
Sun → nearest stars
The nearest stellar neighbours are measured in light-years, vastly farther than the planetary distances inside our system.
The key idea: planetary distances are enormous, but interstellar distances are vastly larger still.
That is one reason our Solar System is the only planetary system humanity can currently explore with spacecraft at close range.
Questions Scientists Ask
The Solar System is a natural laboratory
How did Earth become habitable?
Comparing Earth with Venus and Mars helps scientists investigate how atmospheres, water, climate and geology evolve.
Could moons host habitable environments?
Icy moons with subsurface oceans are among the most intriguing places to investigate beyond Earth.
How do planetary systems form?
Our Solar System provides the closest laboratory for testing models of planet formation and evolution.
Solar System FAQ
Common questions, clearly answered
How many planets are in our Solar System?
There are eight officially recognized planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.
Why is Pluto not classified as a planet?
In 2006 the International Astronomical Union adopted a definition under which a planet must orbit the Sun, be nearly round because of its own gravity, and have cleared the neighbourhood around its orbit. Pluto does not meet the third criterion and is classified as a dwarf planet.
What is the largest planet?
Jupiter is the largest planet in the Solar System.
Which planet is closest to the Sun?
Mercury is the closest planet to the Sun.
Is the Sun a planet?
No. The Sun is a star — the star at the centre of our planetary system.
What is the Kuiper Belt?
It is a broad region beyond Neptune containing many icy bodies, including Pluto and Arrokoth.
Does the Solar System have an edge?
It depends on what boundary you mean. The planetary region ends around Neptune, the Kuiper Belt extends much farther, and the hypothesized Oort Cloud may reach tens of thousands of astronomical units from the Sun.
Is there life elsewhere in the Solar System?
No extraterrestrial life has been confirmed. Earth remains the only world known to support life, while missions investigate places such as Mars and icy moons for evidence about past or present habitability.
How old is the Solar System?
The Solar System formed about 4.6 billion years ago.
Explore Further
Primary resources & interactive tools
Whiteheart9 provides the guide. These official resources provide the deeper data and mission information.
NASA Solar System
NASA's main Solar System exploration hub, with planets, missions, objects and current stories.
NASA Eyes
Launch Eyes on the Solar System and other NASA browser-based 3D visualizations.
NASA JPL Solar System
Explore spacecraft missions and planetary science managed by NASA's Jet Propulsion Laboratory.
NASA Planet Guide
Detailed official information about the eight planets and the recognized dwarf planets.
NASA Kuiper Belt
Learn about the distant icy region beyond Neptune and its exploration.
NASA Oort Cloud
Explore what scientists think about the Solar System's most distant hypothesized reservoir of icy bodies.
Sources & Method
A visual guide built around primary sources
This page is an independent educational resource. Planet classifications, broad facts, Solar System structure and mission history are based primarily on NASA and NASA/JPL material. Visual illustrations on this page are conceptual and are not intended to be scientifically to-scale photographs.
Dynamic mission status and object positions can change. For current spacecraft positions, mission status and the latest discoveries, use the linked official NASA resources.
Last reviewed: September 2026 · Mission status, moon counts and other changing information should be checked against the primary sources above.
Whiteheart9 · Explore the Solar System
An independent educational resource. NASA, NASA JPL and other organizations referenced on this page are not implied to endorse Whiteheart9. External tools, trademarks and data remain the property of their respective organizations.
Whiteheart9 · Solar System
Our Solar System
One star. Eight planets. Dwarf worlds, moons, asteroids, comets and spacecraft — all moving through a vast planetary neighbourhood that extends far beyond the familiar planets.
1StarThe Sun
8PlanetsMercury → Neptune
5Recognized dwarf planetsIncluding Pluto & Ceres
4.6BYears oldApproximate age of the system
The Neighbourhood
What is the Solar System?
The Solar System is the Sun and everything gravitationally bound to it: planets, dwarf planets, moons, asteroids, comets, dust and enormous populations of smaller bodies.
The Sun dominates the system
The Sun supplies almost all of the light and heat experienced by the planets and its gravity controls the large-scale architecture of the planetary system.
Planets are only part of it
Beyond the eight planets are moons, asteroid populations, comets, dwarf planets and distant reservoirs of icy bodies.
The boundary is enormous
The Solar System extends far beyond Neptune. The Kuiper Belt lies beyond Neptune, while the Oort Cloud is thought to form a much more distant spherical shell around the system.
NASA Interactive
Explore the Solar System in 3D
NASA's Eyes on the Solar System uses mission data and imagery to create an interactive simulated view of planets, moons, asteroids, comets and spacecraft. You can move through time and explore missions across the Solar System.
NASA Eyes on the Solar System
Interactive 3D exploration · external NASA application
NASA visualization
If the interactive does not load on your device,
open NASA Eyes on the Solar System directly ↗.
Our Star
The Sun: the engine of our planetary system
The Sun is a star at the centre of our system. Its gravity keeps the planets and smaller bodies in orbit, while its radiation drives much of the space environment around Earth.
Solar wind
Streams of charged particles flow outward from the Sun and interact with planetary magnetic fields and atmospheres.
Solar activity
Flares and coronal mass ejections can send bursts of energy and plasma through interplanetary space.
The Eight Planets
Meet the worlds orbiting our star
The first four planets are rocky terrestrial worlds. Jupiter and Saturn are gas giants; Uranus and Neptune are ice giants.
01 · Terrestrial
Mercury
The smallest planet and the one closest to the Sun. Its heavily cratered surface records a long history of impacts.
02 · Terrestrial
Venus
A rocky planet wrapped in a dense atmosphere. Its powerful greenhouse effect makes its surface extraordinarily hot.
03 · Terrestrial
Earth
Our home world, with liquid surface oceans, a nitrogen-rich atmosphere and the only confirmed life known so far.
04 · Terrestrial
Mars
A cold desert world with volcanoes, canyons, polar ice and abundant evidence that water once shaped its surface.
05 · Gas giant
Jupiter
The largest planet in the Solar System, famous for its immense storms, powerful magnetic environment and many moons.
06 · Gas giant
Saturn
The second-largest planet and one of the most recognizable worlds, surrounded by an immense and complex ring system.
07 · Ice giant
Uranus
A pale blue-green ice giant rotating with a dramatic axial tilt, giving it unusually extreme seasonal geometry.
08 · Ice giant
Neptune
The most distant recognized planet, with deep blue coloration, dynamic weather and some of the fastest winds known on a planet.
Real imagery: The eight planet globes above use photographic NASA/JPL imagery; the motion effects are a visual layer added by Whiteheart9, not a claim that these images are live spacecraft feeds.
Scale warning: This page uses visual sizes and spacing for readability. A true-to-scale
Solar System would make the distances between planets enormous compared with the size of the worlds.
Two Planetary Families
Rocky worlds and giant worlds
Inner planets · Mercury, Venus, Earth, Mars
These terrestrial planets have solid surfaces and are relatively small compared with the giant planets. Their compositions and histories differ, but all formed in the hotter inner region of the young Solar System.
Outer planets · Jupiter, Saturn, Uranus, Neptune
The outer planets are giant worlds. Jupiter and Saturn are gas giants, while Uranus and Neptune are classified as ice giants because of their different bulk compositions.
At a Glance
Compare the eight planets
Useful broad comparisons — not a substitute for the full NASA datasets.
| Planet | Type | Distance from Sun* | Year | Moons** |
|---|---|---|---|---|
| Mercury | Terrestrial | 57.9 million km | 88 days | 0 |
| Venus | Terrestrial | 108.2 million km | 224.7 days | 0 |
| Earth | Terrestrial | 149.6 million km | 365.25 days | 1 |
| Mars | Terrestrial | 227.9 million km | 687 days | 2 |
| Jupiter | Gas giant | 778.5 million km | 11.86 years | Many |
| Saturn | Gas giant | 1.43 billion km | 29.45 years | Many |
| Uranus | Ice giant | 2.87 billion km | 84 years | Many |
| Neptune | Ice giant | 4.50 billion km | 164.8 years | Many |
*Approximate mean distance. **Moon counts can change as new satellites are confirmed.
Worlds Beyond the Eight
Dwarf planets
NASA currently identifies five officially recognized dwarf planets in our Solar System: Ceres, Pluto, Haumea, Makemake and Eris.
Ceres
The largest object in the asteroid belt and the only officially recognized dwarf planet in the inner Solar System.
Pluto
A complex Kuiper Belt dwarf planet visited by New Horizons in 2015, revealing mountains, plains and a striking heart-shaped region.
Haumea
An unusual, rapidly rotating dwarf planet with an elongated shape and a ring.
Makemake
A bright Kuiper Belt dwarf planet discovered beyond Neptune.
Eris
A distant dwarf planet whose discovery helped drive the debate that led to the modern planetary classification.
Possible Planet Nine
A hypothetical distant planet has been proposed to explain patterns in some distant orbits, but no direct evidence of such a planet has been found.
Beyond Neptune
The Solar System does not end at Neptune
The planetary region is only the beginning of the Solar System's outer architecture.
☄ The Kuiper Belt
A broad, doughnut-shaped region of icy bodies beyond Neptune. Pluto and Arrokoth are among the objects associated with this distant population. New Horizons visited Pluto in 2015 and Arrokoth in 2019.
◌ The Oort Cloud
A theoretical, extremely distant spherical shell of icy bodies thought to surround the Solar System. It has not been directly imaged because of its enormous distance.
Where is the edge?
There is no single simple boundary. Different definitions use different physical markers,
including the region dominated by the Sun's gravity, the heliosphere, the Kuiper Belt and the
much more distant Oort Cloud.
The Solar System in Motion
Phenomena worth watching
Our planetary neighbourhood is dynamic — not a collection of motionless spheres.
Auroras
Charged particles interacting with a planetary atmosphere can produce glowing auroral displays.
Eclipses
When one celestial body passes into the shadow of another, spectacular alignments can occur.
Comets
Icy bodies can develop glowing comae and tails when sunlight heats material near the Sun.
Planetary storms
Giant atmospheres can produce enormous storms and weather systems that dwarf terrestrial examples.
Worlds Around Worlds
The moons may be just as fascinating
Some moons are small rocky remnants; others have atmospheres, ice shells, volcanoes, underground oceans or environments that could be important in the search for habitable conditions.
Europa
Jupiter's icy moon is thought to have a global ocean beneath its ice shell and is a major target for exploration.
Enceladus
Saturn's small icy moon ejects plumes of material from its south polar region, revealing an active interior.
Titan
Saturn's largest moon has a thick atmosphere and surface lakes and seas of liquid hydrocarbons.
Io
Jupiter's volcanic moon is the most volcanically active world known in the Solar System.
4.6 Billion Years Ago
How the Solar System formed
Cloud collapses
A cloud of gas and dust collapsed under gravity, forming a dense young Sun at its centre.
Disk forms
Conservation of angular momentum produced a rotating disk of material around the young star.
Planetesimals grow
Dust and rock collided and accumulated into larger bodies, eventually producing protoplanets.
Planets evolve
Gravity, impacts, chemistry and internal processes shaped the worlds we see today.
Humanity's Robotic Eyes
We have sent machines across the neighbourhood
Spacecraft have visited every planet in the Solar System, while missions continue to investigate asteroids, comets, moons and the distant outer system.
Jupiter
Juno
Mission: Studies Jupiter's atmosphere, magnetic field, gravity and interior.
Saturn
Cassini–Huygens
Legacy: Transformed our understanding of Saturn, its rings and moons, including Titan and Enceladus.
Pluto / Kuiper Belt
New Horizons
Milestones: First close-up exploration of Pluto and later the Kuiper Belt object Arrokoth.
Interstellar
Voyager 1 & 2
Legacy: Flew past the outer planets and continue to send information from the distant heliosphere/interstellar region.
Asteroid
OSIRIS-REx
Milestone: Collected a sample from asteroid Bennu and returned it to Earth for laboratory study.
Mars
Curiosity & Perseverance
Role: Investigate Martian geology, climate history and the ancient environments that may once have been habitable.
Asteroid
Psyche
Goal: Travel to the metal-rich asteroid Psyche to investigate a world unlike the rocky planets we have explored.
Jupiter system
Europa Clipper
Goal: Study Europa's ice shell, surface and environment to investigate whether the moon could support conditions suitable for life.
Mercury
BepiColombo
Goal: Study Mercury's surface, interior, magnetic environment and interaction with the solar wind.
Exploration Timeline
From first flybys to planetary laboratories
A selection of milestones that changed our view of the Solar System.
1962
Mariner 2 reaches Venus
The first successful interplanetary mission sends scientific data from another planet back to Earth.
1977
Voyager launches
The twin spacecraft begin a journey that will transform knowledge of the outer planets.
1989
Voyager 2 reaches Neptune
Humanity completes its first close exploration of all four giant planets.
1997–2017
Cassini explores Saturn
More than a decade of observations reveal extraordinary detail about Saturn, its rings and moons.
2015
New Horizons reaches Pluto
The spacecraft returns the first close-up images of Pluto and reveals an unexpectedly active world.
2019
Arrokoth flyby
New Horizons explores a Kuiper Belt object at the most distant planetary flyby yet achieved.
2020
OSIRIS-REx samples Bennu
A spacecraft collects material from an asteroid and later returns the sample to Earth.
2024+
A new era of exploration
Missions including Europa Clipper and Psyche expand the range of worlds we can study directly.
Perspective
How small is our planetary neighbourhood?
The Solar System feels enormous from Earth. On the scale of the Milky Way, however, it is only one tiny planetary system orbiting one star among hundreds of billions.
Earth → Sun
Light from the Sun takes about 8 minutes and 20 seconds to reach Earth.
Earth → Neptune
The outer planets are so distant that light and spacecraft require significant travel time to cross the system.
Sun → nearest stars
The nearest stellar neighbours are measured in light-years, vastly farther than the planetary distances inside our system.
The key idea: planetary distances are enormous, but interstellar distances are vastly larger still.
That is one reason our Solar System is the only planetary system humanity can currently explore with spacecraft at close range.
Questions Scientists Ask
The Solar System is a natural laboratory
How did Earth become habitable?
Comparing Earth with Venus and Mars helps scientists investigate how atmospheres, water, climate and geology evolve.
Could moons host habitable environments?
Icy moons with subsurface oceans are among the most intriguing places to investigate beyond Earth.
How do planetary systems form?
Our Solar System provides the closest laboratory for testing models of planet formation and evolution.
Solar System FAQ
Common questions, clearly answered
How many planets are in our Solar System?
There are eight officially recognized planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.
Why is Pluto not classified as a planet?
In 2006 the International Astronomical Union adopted a definition under which a planet must orbit the Sun, be nearly round because of its own gravity, and have cleared the neighbourhood around its orbit. Pluto does not meet the third criterion and is classified as a dwarf planet.
What is the largest planet?
Jupiter is the largest planet in the Solar System.
Which planet is closest to the Sun?
Mercury is the closest planet to the Sun.
Is the Sun a planet?
No. The Sun is a star — the star at the centre of our planetary system.
What is the Kuiper Belt?
It is a broad region beyond Neptune containing many icy bodies, including Pluto and Arrokoth.
Does the Solar System have an edge?
It depends on what boundary you mean. The planetary region ends around Neptune, the Kuiper Belt extends much farther, and the hypothesized Oort Cloud may reach tens of thousands of astronomical units from the Sun.
Is there life elsewhere in the Solar System?
No extraterrestrial life has been confirmed. Earth remains the only world known to support life, while missions investigate places such as Mars and icy moons for evidence about past or present habitability.
How old is the Solar System?
The Solar System formed about 4.6 billion years ago.
Explore Further
Primary resources & interactive tools
Whiteheart9 provides the guide. These official resources provide the deeper data and mission information.
NASA Solar System
NASA's main Solar System exploration hub, with planets, missions, objects and current stories.
NASA Eyes
Launch Eyes on the Solar System and other NASA browser-based 3D visualizations.
NASA JPL Solar System
Explore spacecraft missions and planetary science managed by NASA's Jet Propulsion Laboratory.
NASA Planet Guide
Detailed official information about the eight planets and the recognized dwarf planets.
NASA Kuiper Belt
Learn about the distant icy region beyond Neptune and its exploration.
NASA Oort Cloud
Explore what scientists think about the Solar System's most distant hypothesized reservoir of icy bodies.
Sources & Method
A visual guide built around primary sources
This page is an independent educational resource. Planet classifications, broad facts, Solar System structure and mission history are based primarily on NASA and NASA/JPL material. Visual illustrations on this page are conceptual and are not intended to be scientifically to-scale photographs.
Dynamic mission status and object positions can change. For current spacecraft positions, mission status and the latest discoveries, use the linked official NASA resources.
Last reviewed: September 2026 · Mission status, moon counts and other changing information should be checked against the primary sources above.
Whiteheart9 · Explore the Solar System
An independent educational resource. NASA, NASA JPL and other organizations referenced on this page are not implied to endorse Whiteheart9. External tools, trademarks and data remain the property of their respective organizations.