Astronomy & space · Curated list
Earth, Moon, Mars and 27 more, ranked by how much of the world has written about each one.
Most written-about first. Each description summarises the planet or moon's Wikipedia article, which its name links to.
1
Third planet from the Sun
Third in order from the Sun, the one planet, and the one astronomical object, where life is known to exist. What makes that possible is that Earth is an ocean world: no other world in the Solar System keeps liquid water on its surface.
2
Natural satellite orbiting Earth
Earth's only natural satellite, orbiting at an average distance of 384,399 kilometres (238,854 mi).
Wikidata · Photo: Gregory H. Revera, CC BY-SA 3.0
3
Fourth planet from the Sun
The fourth planet from the Sun, called the "Red Planet" because it looks orange-red.
Wikidata · Photo: Kevin Gill from Los Angeles, CA, United States, CC BY 2.0
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4
Second planet from the Sun
The second planet from the Sun. Close to Earth in mass and size, it has no water in liquid form, and its atmosphere is much thicker and denser than any other rocky body's in the Solar System.
Wikidata · Photo: NASA/JPL-Caltech, Public domain
5
First planet from the Sun
The Solar System's smallest planet, and the one nearest the Sun. A rocky planet with only a trace of atmosphere, it has slightly weaker surface gravity than Mars.
Wikidata · Photo: NASA / Johns Hopkins University Applied Physics Laboratory / Carnegie Institution of Washington . Edited version of…, Public domain
6
Fifth planet from the Sun
Fifth in order from the Sun, and the biggest planet of the Solar System. A gas giant, it has almost 2.5 times the mass of all the other planets put together, and a little under one-thousandth of the Sun's mass.
Wikidata · Photo: NASA/STSCI (S.T.A.R.S), Public domain
7
Sixth planet from the Sun
The sixth planet from the Sun, and after Jupiter the second largest in the Solar System. It is a gas giant whose average radius is roughly 9 times Earth's.
Wikidata · Photo: Credit: NASA/JPL-Caltech/SSI, Public domain
8
9
Eighth planet from the Sun
The eighth planet from the Sun and the farthest known to orbit it. By diameter it is the Solar System's fourth-largest planet, by mass the third, and it is the densest of the giant planets.
Wikidata · Photo: NASA / Voyager 2 / PDS / OPUS / Ardenau4, CC0
10
Largest dwarf planet in the Solar System
A dwarf planet in the Kuiper belt, the ring of bodies beyond Neptune's orbit. Of the known objects orbiting the Sun directly, it is ninth by size and tenth by mass.
Wikidata · Photo: NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute/Alex Parker, Public domain
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11
Dwarf planet in the asteroid belt
A dwarf planet orbiting in the main asteroid belt, which lies between Jupiter's orbit and that of Mars. It was the first object found in the belt: Giuseppe Piazzi discovered it on 1 January 1801 at the Palermo Astronomical Observatory in Sicily, and it was announced as a new planet.
Wikidata · Photo: Justin Cowart, Public domain
12
Most massive dwarf planet
The Solar System's most massive dwarf planet, and the second-largest known. A trans-Neptunian object (TNO) belonging to the scattered disk, it follows a highly eccentric orbit.
Wikidata · Photo: NASA, ESA, and M. Brown (California Institute of Technology), Public domain
13
Largest moon of Saturn
Saturn's biggest moon and the second biggest in the Solar System. No other moon is known to have a thick atmosphere, and apart from Earth it is the only known body in the Solar System with clear evidence of lasting liquid on its surface.
Wikidata · Photo: NASA/JPL-Caltech/SSI/Kevin M. Gill, CC BY 2.0
14
Larger of the two moons of Mars
The larger of Mars's two natural satellites, and the one closer in; the other is Deimos. The American astronomer Asaph Hall discovered both moons in 1877.
Wikidata · Photo: NASA / JPL-Caltech / University of Arizona, Public domain
15
Smallest Galilean moon of Jupiter
The smallest and lightest of the four Galilean moons of Jupiter. It can be seen from Earth through ordinary binoculars, and it is a moon of planetary mass, a little smaller and lighter than Earth's Moon.
Wikidata · Photo: NASA/JPL/DLR, Public domain
16
17
Innermost Galilean moon of Jupiter
Of Jupiter's four Galilean moons, the one closest in and the second smallest. A little bigger than Earth's Moon, it ranks fourth in size among the Solar System's natural satellites; no natural satellite is denser or has stronger surface gravity, and no known body in the Solar System has less water by atomic ratio.
Wikidata · Photo: NASA / SWRI / MSSS / Jason Perry, CC BY-SA 3.0
18
Smaller and outer moon of Mars
The smaller of Mars's two natural satellites, and the one farther out; the other is Phobos. Its mean radius is 6.2 km (3.9 mi), and one orbit of Mars takes it 30.3 hours.
Wikidata · Photo: NASA/JPL/University of Arizona, Public domain
19
Largest moon of Jupiter
A natural satellite of Jupiter, the biggest and heaviest moon in the Solar System. Like Titan, Saturn's largest moon, it is bigger than the planet Mercury, but, being less dense, its surface gravity is somewhat weaker than that of Earth's Moon, Io or Mercury.
Wikidata · Photo: NASA/JPL-Caltech/SwRI/MSSS/Kevin M. Gill, CC BY 2.0
20
Dwarf planet with a ring and two moons
A dwarf planet beyond the orbit of Neptune, with minor-planet number 136108. A team led by Mike Brown of Caltech discovered it at the Palomar Observatory in 2004; in 2005 a team led by José Luis Ortiz Moreno at Spain's Sierra Nevada Observatory announced it formally, having found it that year in precovery images the team had taken in 2003.
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21
Second-largest moon of Jupiter
Jupiter's second-largest moon, after Ganymede. It is the third-largest moon in the Solar System, behind Ganymede and Saturn's Titan, and almost as big as the planet Mercury, though with only about a third of Mercury's mass.
Wikidata · Photo: Kevin Gill from Los Angeles, CA, United States, CC BY 2.0
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22
23
Largest natural satellite of Pluto
Formally (134340) Pluto I, the biggest of the dwarf planet Pluto's five known natural satellites. Its mean radius is 606 km (377 mi).
Wikidata · Photo: NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute/Alex Parker, Public domain
24
Natural satellite orbiting Saturn
Saturn's sixth-largest moon, and 18th in size among the moons of the Solar System. It is roughly 500 kilometres across, around a tenth the diameter of Titan, Saturn's largest moon.
Wikidata · Photo: National Aeronautics and Space Administration (NASA) / Jet Propulsion Laboratory (JPL), Public domain
25
26
Moon of Uranus
The outermost of Uranus's major moons and the second-largest. It is second in mass among the moons of Uranus, and tenth in size among all the moons of the Solar System.
Wikidata · Photo: Kevin M. Gill, CC BY 2.0
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27
Largest moon of Uranus
Uranus's biggest moon and the eighth-largest in the Solar System, 1,577 km across. William Herschel discovered it in 1787, and it takes its name from the fairy queen of Shakespeare's A Midsummer Night's Dream. It orbits within the magnetosphere of Uranus.
Wikidata · Photo: Titania_(moon)_color.jpg : NASA/JPL, Public domain
28
Moon of Saturn
Saturn's seventh-largest natural satellite. At a mean diameter of 396.4 kilometres (246.3 miles), it is the smallest body known to have been made roughly round by its own gravity.
Wikidata · Photo: NASA / JPL-Caltech / Space Science Institute, Public domain
29
Second-largest moon of Saturn
Saturn's second-largest natural satellite, 1,528 kilometres (949 mi) across, and ninth in size among the Solar System's moons. No smaller body in the Solar System is confirmed to be in hydrostatic equilibrium.
Wikidata · Photo: NASA / JPL / Space Science Institute, Public domain
30
Every Wikidata item that is a planet, a dwarf planet or a moon, and that has its own English Wikipedia article, ranked by the number of Wikimedia sites with a page about it — Wikipedia's language editions, mostly, and sister projects such as Wikiquote. That counts how many communities independently thought it worth describing, and nobody can buy a place on it. The top 30 are shown.
Fetched from Wikidata on 2026-09-25. Each description is this site's summary of the entry's Wikipedia article, which its name links to: the wording is ours, the facts are Wikipedia's, licensed CC BY-SA 4.0. To correct an entry, correct it there; the next refresh carries the change.
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