Eris

Cosma / Communication / Knowledge / Realm / Physical / Universe / Solar System / Scattered Disc / Eris
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Eris (minor-planet designation 136199 Eris) is the most massive and second-largest known dwarf planet in the Solar System. It is a Trans-Neptunian object (TNO) in the scattered disk and has a high-eccentricity orbit. Eris was discovered in January 2005 by a Palomar Observatory-based team led by Mike Brown and verified later that year. In September 2006, it was named after the Greco–Roman goddess of strife and discord. Eris is the ninth-most massive known object orbiting the Sun and the sixteenth-most massive overall in the Solar System (counting moons). It is also the largest object that has not been visited by a spacecraft. Eris has been measured at 2,326 ± 12 kilometers (1,445 ± 7 mi) in diameter; its mass is 0.28% that of the Earth and 27% greater than that of Pluto, although Pluto is slightly larger by volume. Eris has one known moon, Dysnomia. — Wikipedia

Eris (Encyclopædia Britannica)

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Inspiration

Standing on Eris The Most Massive Dwarf Planet (Dreksler Astral, YouTube Video)

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Innovation

Science

Eris (NASA Science)

Eris (Mike Brown’s Planets)

Eris (International Astronomical Union)

Eris (Wolfram Alpha)

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Preservation

History

Eris: The First Dwarf Planet (Nola Taylor Tillman, Space.com)

Library

Subject: Eris (Library Thing)

Subject: Eris (WorldCat)

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Participation

Education

Eris – Level 1 (StarChild, Goddard Space Flight Center, NASA)
Eris – Level 2 (StarChild, Goddard Space Flight Center, NASA)

Small Solar System Bodies Learning Resources (National Air and Space Museum)
Dwarf Planets Learning Resources (National Air and Space Museum)

MERLOT: Multimedia Educational Resource for Learning and Online Teaching
OER Commons: Open Educational Resources

Community

Organization

Minor Planet Center (International Astronomical Union)
Asteroids & Remote Planets Section (British Astronomical Association)

News

Eris (Nova Research Highlights, American Astronomical Society)
Eris (EurekaAlert, AAAS)
Eris (Astronomy Magazine)
Eris (JSTOR)
Eris (Science Daily)
Eris (Phys.org)

Recent News from Phys.org …

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on October 27, 2026 at 10:30 pm
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