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* Notable Features: Occator Crater

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* Notable Features: Occator CraterCrater, Ahuna Mons


Named after a patron deity of Hawai'i, Haumea (pronounced "how me a") was the last of the dwarf planets to be officially recognized as such and its place in this category is still widely contested. The main problem with designating Haumea as a dwarf planet, and also its most distinctive feature, is its unusually high rotational speed which causes it to be significantly flattened at its equator, making it an ellipsoid rather than a spheroid like other dwarf planets.

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Named after a patron deity of Hawai'i, Haumea (pronounced "how me a") uh") was the last of the dwarf planets to be officially recognized as such and its place in this category is still widely contested. The main problem with designating Haumea as a dwarf planet, and also its most distinctive feature, is its unusually high rotational speed which causes it to be significantly flattened at its equator, making it an ellipsoid rather than a spheroid like other dwarf planets.


Named after a patron deity of Hawai'i, Haumea was the last of the dwarf planets to be officially recognized as such and its place in this category is still widely contested. The main problem with designating Haumea as a dwarf planet, and also its most distinctive feature, is its unusually high rotational speed which causes it to be significantly flattened at its equator, making it an ellipsoid rather than a spheroid like other dwarf planets.

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Named after a patron deity of Hawai'i, Haumea (pronounced "how me a") was the last of the dwarf planets to be officially recognized as such and its place in this category is still widely contested. The main problem with designating Haumea as a dwarf planet, and also its most distinctive feature, is its unusually high rotational speed which causes it to be significantly flattened at its equator, making it an ellipsoid rather than a spheroid like other dwarf planets.



Makemake is the last dwarf planet to be discovered. It was named after the creator deity in the myths of Papa Nui, the native people of Easter Island. Prior to that, it was called an "Easterbunny" due to the date of discovery falling shortly after Easter. Its mass is about 0.07% that of Earth, making it slightly more massive than Haumea. It has one natural satellite (officially designated "[=S/2015 (136472) 1=]" or nicknamed "[=MK2=]"), which sadly doesn't have a creative name as of yet.

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Makemake (pronounced "mackie mackie") is the last dwarf planet to be discovered. It was named after the creator deity in the myths of Papa Nui, the native people of Easter Island. Prior to that, it was called an "Easterbunny" due to the date of discovery falling shortly after Easter. Its mass is about 0.07% that of Earth, making it slightly more massive than Haumea. It has one natural satellite (officially designated "[=S/2015 (136472) 1=]" or nicknamed "[=MK2=]"), which sadly doesn't have a creative name as of yet.


Currently, there are five objects in our solar system recognized as dwarf planets:

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Currently, there are five objects in our solar system recognized as dwarf planets:
planets, with more than forty pending official confirmation:



Ceres has a complicated history of designations given to it since its discovery, even more so than Pluto. It was originally labeled as a planet until 1802 when similar small objects were discovered in Ceres' vicinity. William Herschel at the time coined the term "asteroid" to distinguish them from the other planets and labeled Ceres as such, and until 2006 with the reclassification of dwarf planets by the IAU, it was officially labeled as the largest asteroid in the Asteroid Belt for well over two centuries.

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Ceres has a complicated history of designations given to it since its discovery, even more so than Pluto. It was originally labeled as a planet until 1802 when similar small objects were it was discovered in Ceres' vicinity. on New Year's day 1801, and was quickly joined by the asteroids Pallas, Juno, and Vesta. Cere's discovery was taken as proof of the [[ScienceMarchesOn now-defunct]] Titus-Bode law. William Herschel argued as early as 1802 that Ceres and Pallas were not planets and at the time coined the term "asteroid" to distinguish them from the other planets and labeled Ceres as such, but his opinion was in the minority until the discovery of the fifth asteroid, Astraea in 1845. By then, telescope technology had advanced enough that thousands of asteroids were discovered over the next few years, and astronomers accepted that Ceres was merely the first. Ceres, Pallas, Juno, and Vesta were formally demoted from planet status in 1851, [[OlderThanTheyThink the first to do so]]. Their demotion also notably occurred after the discovery of Neptune in 1846; few people remember that Neptune spent its first five years post-discovery as the solar system's twelfth planet. Ceres remained classified as an asteroid until 2006 with the reclassification of dwarf planets by the IAU, IAU; it was officially labeled as the sole dwarf planet in the inner solar system after being classified as the largest asteroid in the Asteroid Belt for well over two centuries.
a century and a half.



Pluto's name was famously suggested by Venetia Burney, at the time an eleven year-old student at Oxford. Burney was well-versed in Classical Mythology and felt that the god of the underworld was a fitting name for such a cold and dark planet. Her grandfather was a librarian at Oxford who saw that Burney's suggestion was relayed to Tombaugh; that same grandfather was the brother of the man who suggested the names currently used for Mars's moons. Burney lived to see Pluto's demotion, and stated in an interview that while her personal preference was for it to remain a planet, she understood why it was demoted. Burney was reportedly [[BerserkButton not happy]] when people mistakenly claimed that she took the name Pluto from [[WesternAnimation/PlutoThePup Mickey Mouse's Dog]]



Pluto's most peculiar feature is its largest moon, Charon, which has one-eighth of Pluto's mass - an unusually big proportion for a planet and a moon. It lead to Pluto being occasionally labeled a dual planet, since calling Charon a satellite isn't fully accurate with how the objects revolve around one center of mass. In addition, Pluto has four other irregular moons named Styx, Nix, Kerberos, and Hydra, which compared to Charon, are likely captured small Kuiper Belt objects similar to UsefulNotes/{{Mars}}' asteroid moons; Phobos and Deimos.

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Pluto's most peculiar feature is its largest moon, Charon, which has one-eighth of Pluto's mass - an unusually big proportion for a planet and a moon. It lead to Pluto being occasionally labeled a dual planet, since calling Charon a satellite isn't fully accurate with how the objects revolve around one center of mass. mass that lies in the empty space above Pluto's surface. Pluto and Charon also have the distinction of being the only gravitationally round objects to have achieved a [[TidallyLockedPlanet two-way tidal lock]] within the lifespan of the solar system; no matter what, Pluto and Charon ''always'' show each other the same face, like two dancers holding hands while spinning in a circle. In addition, Pluto has four other irregular moons named Styx, Nix, Kerberos, and Hydra, which compared to Charon, are likely captured small Kuiper Belt objects similar to UsefulNotes/{{Mars}}' asteroid moons; Phobos and Deimos.
Deimos. They are also hypothesized to be leftover debris from the giant impact that created Charon that somehow failed to coalesce.



Like Ceres before it, Pluto's demotion was largely a result of improvements in telescope technology. When first discovered, Pluto was thought to be [[{{Irony}} the solar system's largest planet]], surpassing even Jupiter. As telescope resolution improved, Pluto gradually "shrunk", going from similar in size to Uranus and Neptune, to similar to Earth and Venus, to similar to Mars. It was joked that [[HilariousInHindsight Pluto was going to disappear entirely at the rate they were going]]. The beginning of the end came with the discovery of Charon in 1978. With a natural satellite in play, astronomers could finally apply [[https://en.wikipedia.org/wiki/Kepler%27s_laws_of_planetary_motion#Third_law Kepler's Third Law]] to get a reasonably accurate measurement of Pluto's mass, discovering that Pluto was dwarfed even by our own Moon. Charon's discovery also occurred shortly after the introduction of the Giant Impact Hypothesis that explained the origin of Earth's moon. The similarities between the two systems was quickly noticed, and Charon was suggested to have formed the same way. This raised the obvious question of where the impactor that caused Charon's creation came from; probability alone indicated that Pluto wasn't alone in its region of space, and astronomers began actively searching for other members of the hypothetical Kuiper Belt.

The search bore fruit with the discovery of [[https://en.wikipedia.org/wiki/15760_Albion Albion]] in 1992. Initially declared the first member of the Kuiper Belt, it didn't take long to realize that the honor actually belonged to Pluto. The debate over Pluto's classification began in earnest, especially as dozens more Kuiper Belt Objects and Scattered Disc Objects were discovered over the next decade. Public pressure however led to the issue being held off until it was finally forced with the discovery of Eris in 2005. Once a Trans-Neptunian Object more massive than Pluto was confirmed, the classification issue could no longer be pushed down the line, and Pluto was formally demoted in 2006.



Eris is slightly smaller than Pluto, but its mass is higher, making it to 23% the mass of the Moon. It has one known moon named Dysnomia -- daughter of mythological Eris. Aside from being the ninth most massive object orbiting the Sun, it is also the next largest object in the Kuiper Belt that has not yet been visited by man-made objects. Given its massive distance from the Earth, this is unlikely to change any time soon.

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Eris is the most notable member of the Scattered Disk, former members of the Kuiper Belt that were forced into heavily inclined and eccentric orbits after getting too close to Neptune's gravity well. Eris's orbit is tilted a whopping 44° and it has a difference of 59.455 AU between it's perihelion and aphelion. The fact that Eris was completely at the mercy of Neptune's gravity while Neptune itself was completely unaffected by Eris is considered one of the key distinctions between dwarf planets and true planets.

Eris is slightly smaller than Pluto, but its mass is higher, making it to 23% the mass of the Moon. The resulting higher density indicates that Eris has proportionally more rock content than the other outer dwarf planets. It has one known moon named Dysnomia -- daughter of mythological Eris. Aside from being the ninth most massive object orbiting the Sun, it is also the next largest object in the Kuiper Belt that has not yet been visited by man-made objects. Given its massive distance from the Earth, this is unlikely to change any time soon.

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* ''Literature/TheJenkinsverse'': Ceres is the main base of an asteroid mining company, named Hephaestus Consortium. They are Earth's premiere space-based mining operation, and develop some of the setting's future-tech.


* Ceres is a location of several missions in ''VideoGame/{{Warframe}}''. Originally {{terraform}}ed by [[{{Precursors}} the Orokin]], this dwarf planet has since then been occupied by [[CloneArmy Grineer]] who promptly used it as their empire's [[EternalEngine industrial centre]], turning it into a PollutedWasteland as a side effect.



Despite its size and importance to astronomy, Eris hasn't appeared in many works, largely because not much time has passed since its discovery. Notably though, it is a key location in ''Literature/SaturnsChildren''.

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Despite its size and importance to astronomy, Eris hasn't appeared in many works, largely because not much time has passed since its discovery. Notably though, it is a key location in ''Literature/SaturnsChildren''.''Literature/SaturnsChildren''.

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* Notable Features: Occator Crater



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'''Profile'''
* Diameter: 2,326 km
* Mass: 0.0028 of Earth
* Density: 2.52 g/cm3
* Surface Gravity: 0.08 g
* Semi-major Axis: 67.78 AU
* Orbital Period: 558 Years
* Rotational Period: 25 Hours
* Axial Tilt: Unknown
* Average Surface Temperature: -230° C
* Number of Moons: 1
]



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[floatboxright:
'''Profile'''
* Diameter: 1,430 km
* Mass: 0.00073 of Earth
* Density: 3.05 g/cm3
* Surface Gravity: 0.06 g
* Semi-major Axis: 45.56 AU
* Orbital Period: 307 Years
* Rotational Period: 22 Hours
* Axial Tilt: Unknown
* Average Surface Temperature: -231° C Estimate
* Number of Moons: 1
]



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[floatboxright:
'''Profile'''
* Diameter: 1,632 km
* Mass: 0.00066 of Earth
* Density: 2.6 g/cm3
* Surface Gravity: 0.04 g at Equator
* Semi-major Axis: 43.21 AU
* Orbital Period: 284 Years
* Rotational Period: 4 Hours
* Axial Tilt: Unknown
* Average Surface Temperature: -223° C
* Number of Moons: 2
]



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[floatboxright:
'''Profile'''
* Diameter: 2,376 km
* Mass: 0.00218 of Earth
* Density: 1.88 g/cm3
* Surface Gravity: 0.06 g
* Semi-major Axis: 39.48 AU
* Orbital Period: 248 Years
* Rotational Period: 6 Days (Tidally Locked to Charon)
* Axial Tilt: 122.53°
* Average Surface Temperature: -229° C
* Notable Features: Tombaugh Regio, Cthulhu Macula
* Number of Moons: 5
* Number of Total Missions: 1
]



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[floatboxright:
'''Profile'''
* Diameter: 946 km
* Mass: 0.00015 of Earth
* Density: 2.08 g/cm3
* Surface Gravity: 0.03 g
* Semi-major Axis: 2.76 AU
* Orbital Period: 4 Years
* Rotational Period: 9 Hours
* Axial Tilt: 4°
* Average Surface Temperature: -105° C
* Number of Total Missions: 1
]


** ''Literature/TheDyingNight'': Battersley Ryger spent the past ten years living on Ceres, where the telescopes are aimed at everything outside of the asteroid belt. The [[ArtificialGravity pseudo-grav fields]] adjust conditions to 80% of Earth-normal gravity, but the asteroid rotates in only two hours.

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** ''Literature/TheDyingNight'': "Literature/TheDyingNight": Battersley Ryger spent the past ten years living on Ceres, where the telescopes are aimed at everything outside of the asteroid belt. The [[ArtificialGravity pseudo-grav fields]] adjust conditions to 80% of Earth-normal gravity, but the asteroid rotates in only two hours.


Named after a Roman goddess of agriculture, Ceres is the largest and only dwarf planet in the Asteroid Belt, making up about a third of belt's mass. It is the smallest of all the dwarf planets, but was the first to be discovered due to its proximity to Earth relative to the other ones. It has gravity of less than 3% that of Earth and possesses a tenuous atmosphere consisting largely of water vapor.

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Named after a Roman goddess of agriculture, Ceres is the largest and only dwarf planet in the Asteroid Belt, making up about a third of the belt's mass. It is the smallest of all the dwarf planets, but was the first to be discovered due to its proximity to Earth relative to the other ones. It has gravity of less than 3% that of Earth and possesses a tenuous atmosphere consisting largely of water vapor.



Pluto is the largest of the dwarf planets, though not quite the most massive. Its mass is less than a fifth of that of the Moon, and it has a surface area roughly similar to that of Russia. It consists of a silicone core covered by a thick layer of ice. Similar to [[UsefulNotes/TheMoonsOfJupiter Europa]], it likely has a liquid ocean beneath its crust. It has no magnetic field to speak of.

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Pluto is the largest of the dwarf planets, though not quite the most massive. Its mass is less than a fifth of that of the Moon, its surface gravity is 6% of Earth's, and it has a surface area roughly similar to that of Russia. It consists of a silicone core covered by a thick layer of ice. Similar to [[UsefulNotes/TheMoonsOfJupiter Europa]], it likely has a liquid ocean beneath its crust. It has no magnetic field to speak of.


* Ceres appears in fiction from time to time. Its first major appearance came in ''Literature/EdisonsConquestOfMars'', where the martians are engaged in a war with beings from Ceres.

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* Ceres appears in fiction from time to time. Its Ceres' first major appearance came in ''Literature/EdisonsConquestOfMars'', where the martians are engaged in a war with beings from Ceres.

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