Eris could be slushier than Pluto because it’s likely made up of a rocky core and an icy shell that’s convecting. Pluto’s shell is conductive. 

Here’s some information about Eris: 

• Size: Eris has a diameter of 2,326 km, which is slightly smaller than Pluto’s 2,370 km. 
• Temperature: Eris’s surface temperature varies from -217°C to -243°C. 
• Orbit: Eris’s orbit is eccentric and distant, which causes its surface temperature to vary. 
• Appearance: Eris appears almost white, unlike Pluto and Triton, which are reddish. 

Here’s some information about Pluto: 

• Temperature: Pluto’s average temperature is -232°C. 
• Orbit: Pluto’s orbit is far from the Sun, so its surface temperature doesn’t vary much.

Eris is one of the largest dwarf planets in our solar system. It’s about the same size as Pluto, but it’s three times farther from the Sun. Eris has a mass of 0.276 Earth masses, while Pluto’s mass is 0.0024 Earth masses. 

Here’s some more information about Eris: 

• Composition Eris seems to be similar to Pluto in composition, with deposits of methane ice on the surface. 
• Orbit Eris orbits at an average distance of 68 AU (that is, 68 times the Earth’s distance from the sun) and takes 561.4 Earth years to circle the sun.

Pluto and Eris are essentially twins—except that Eris is slightly the pudgier of the two,” says Brown. “And a little colder,” adds Schaller. The reason for Eris’s blustery surface conditions is its sheer distance from the sun

Yes, Eris is colder than Pluto: 

• Eris Average temperature is around -400°F (-240°C). Its surface temperature can range from -405°F (-243°C) to -359°F (-217°C). 
• Pluto Average temperature is around -380°F (-229°C). Its surface temperature can range from -400°F (-240°C) to -360°F (-218°C). 

Eris’s distance from the Sun is the reason for its low temperatures. Pluto’s low temperatures are also due to its distance from the Sun

Here are some planets that are colder than Pluto: 

• Neptune The coldest planet in the solar system. It’s the outermost planet from the sun. 
• Uranus The coldest planet in the solar system. It has the coldest atmosphere of any planet in the solar system. 
• Triton Neptune’s moon, which is colder than Pluto.

• Sedna Its surface temperature is believed to be just 12 K, which is a third of Pluto’s average. 

Other planets in the solar system include: 

• Venus: The hottest planet in the solar system. 
• Neptune: The second coldest planet. 
• Ice giants: Uranus and Neptune are known as ice giants because they are made up of large amounts of rock, water, ammonia, and methane ice crystals.

Eris (dwarf planet) 

• Size: One of the largest dwarf planets in the solar system, about the same size as Pluto 
• Distance from the sun: Three times farther away than Pluto 
• Orbit: Revolves around the sun in the Kuiper belt, beyond the orbits of Pluto and Neptune 
• Discovery: Discovered in 2005 by Michael E. Brown, David L. Rabinowitz, and Chad Trujillo 
• Moons: Has at least one moon, Dysnomia 

The International Astronomical Union recognizes five dwarf planets in the solar system: Eris, Ceres, Haumea, Makemake, Pluto. 

Eris (Greek goddess) 

• Title: Goddess of discord and strife 
• Roman equivalent: Discordia 
• Appearance: Most famous for throwing the Golden Apple that started the dispute between goddesses leading up to the Trojan War 
• Parentage: Some say she is the daughter of Nyx, the goddess of night. Others say she is the sister of Ares, the god of war.

The dwarf planet Eris was discovered by a team of astronomers at the Palomar Observatory on January 5, 2005. The team included: 

• Mike Brown: A professor of planetary astronomy at the California Institute of Technology 
• Chad Trujillo: From the Gemini Observatory 
• David Rabinowitz: From Yale University 

The discovery was announced on July 29, 2005

Eris was originally called Xena. It’s about 1,445 miles in diameter and 27% more massive than Pluto. Eris has a thin, icy surface that’s mostly covered with nitrogen ice

No spacecraft has visited Eris. It’s the largest object in the solar system that hasn’t been visited by a spacecraft. Eris is too small and too far away to see without a strong telescope

The James Webb Space Telescope launched in 2021 and will provide a better look at Eris. The telescope will study small objects in the solar system to learn more about their landscapes.

Dwarf planet Eris, similar in size to its better-known cosmic cousin Pluto, has remained an enigma since being discovered in 2005 lurking in the solar system’s far reaches. While Pluto was explored by NASA’s New Horizons spacecraft during a 2015 flyby, Eris – about 40% further from the sun – has never been visited

Eris is currently 14,216,430,347 kilometers from Earth, which is equivalent to 95.030967 Astronomical Units. Light takes 13 hours, 10 minutes, and 18.1406 seconds to travel from Eris to Earth. 

Eris is about 68 times further from the sun than Earth. It takes sunlight more than nine hours to travel from the sun to the surface of Eris

A day on Eris lasts 25.9 Earth hours. This is slightly longer than a day on Earth. Eris’s rotation is similar to Earth’s, but its orbit around the sun is much longer. 

Here are some other facts about Eris: 

• Orbit: Eris has the most highly inclined orbit of all the dwarf planets. It’s tilted almost 47 degrees from the plane of the planets’ orbits. 
• Surface temperature: Eris’s surface temperature varies from -217 degrees Celsius to -243 degrees Celsius. 
• Year: A year on Eris is equal to 557 Earth years. 
• Moon: Eris has one moon called Dysnomia.

Here are some more interesting facts about Eris: 

• Surface Eris’s surface is probably frozen over and covered with nitrogen ice. Scientists believe it also has frozen methane on its surface. 
• Moon Eris’s moon, Dysnomia, takes 16 Earth days to orbit the planet. Dysnomia is named after the daughter of the Greek goddess Eris. 
• Orbit Eris’s orbit is highly elliptical and tilted compared to the other planets. 
• Mass Eris is the most massive dwarf planet in the solar system, with a mass 28% greater than Pluto. 
• Name Eris was originally called Xena, but other rejected names include Lila and Persephone.(full article source google)

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