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Kuiper belt

An artist’s illustration of a brownish orb in front of a background of white stars. A ring made up of small gray pieces of debris surrounds the orb. To the left of the planet is a smaller brownish orb. To the right is a bright star.
Posted inNews

Quaoar’s Ring Defies Gravity

Kimberly M. S. Cartier, News Writing and Production Intern for Eos.org by Kimberly M. S. Cartier 3 March 202315 March 2023

The dwarf planet’s ring makes astronomers question whether a long-held theory about ring and moon formation needs tweaking.

Image of Arrokoth showing the main geological features as well as total surface acceleration.
Posted inEditors' Highlights

A Glimpse at Planet Formation at the Dawn of the Solar System

by Matthias Grott 22 June 202221 December 2022

The low density of Kuiper Belt Object Arrokoth sheds light on the formation of planetesimals in the early solar system.

‘Oumuamua已经在星际空间中游荡了数百万年
Posted inResearch Spotlights

‘Oumuamua可能是类冥王星系外行星的冰碎片

Sarah Stanley, Science Writer by Sarah Stanley 28 June 202121 February 2023

研究人员认为氮冰是最可能构成这一神秘星际物体的物质。

‘Oumuamua has tumbled through interstellar space for millions of years.
Posted inResearch Spotlights

‘Oumuamua May Be an Icy Fragment of a Pluto-Like Exoplanet

Sarah Stanley, Science Writer by Sarah Stanley 19 May 202121 February 2023

Researchers favor nitrogen ice as the most likely material for the mysterious interstellar object’s composition.

Black-and-white photo of Hygiea, a nearly spherical celestial object
Posted inNews

Meet Hygiea, the Smallest Dwarf Planet in Our Solar System

Javier Barbuzano, Science Writer by Javier Barbuzano 26 November 201917 February 2023

New observations confirm that main asteroid belt object Hygiea is round. It now fulfills all the requirements to graduate from asteroid to dwarf planet.

Detail of craters on Pluto’s moon Charon
Posted inNews

Pluto’s and Charon’s Craters Reveal a Solar System Deficit

Katherine Kornei, Science Writer by Katherine Kornei 1 March 20196 January 2023

The New Horizons spacecraft recorded images of craters that imply an unexpected dearth of small objects in the Kuiper Belt.

2014 MU69 as imaged by the New Horizons spacecraft
Posted inNews

New Horizons Sends First Looks of 2014 MU69

Kimberly M. S. Cartier, News Writing and Production Intern for Eos.org by Kimberly M. S. Cartier 4 January 20196 January 2023

Explore 10 things scientists have already learned about the most distant object visited by a spacecraft from Earth.

Artist’s conception of Ultima Thule
Posted inNews

New Horizons Spacecraft to Reach Farthest Body in Solar System Yet

Jenessa Duncombe, Staff Writer by Jenessa Duncombe 28 December 20186 January 2023

The flyby of Ultima Thule on New Year’s Day will give us our first glimpse of a mysterious Kuiper Belt object.

Composite enhanced color images of Pluto (bottom right) and its moon Charon (top left), taken by NASA’s New Horizons in 2015.
Posted inNews

New Book Conveys Details and Flavor of First Mission to Pluto

by Randy Showstack 1 May 201817 November 2021

New Horizons principal investigator tells Eos that the mission has revolutionized our understanding of small planets.

An image of Pluto captured by NASA’s New Horizons probe.
Posted inNews

Six Things Dwarf Planets Have Taught Us About the Solar System

JoAnna Wendel, freelance science writer and illustrator by JoAnna Wendel 17 August 20167 March 2022

It's been 10 years since Pluto was reclassified as a dwarf planet. But no matter the label, it and its dwarf planet cousins continue to stun researchers with their complexity.

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By Luke C. Skinner and Edouard Bard

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