Arrokoth (2014 MU69)

New Horizons continues to shed light on the mysterious planets and smaller bodies of the outer solar system.

The path through the solar system is a rocky road. Asteroids, comets, Kuiper Belt Objects—all kinds of small bodies of rock, metal and ice are in constant motion as they orbit the Sun. But what’s the difference between them? Why do these miniature worlds fascinate space explorers so much?

NASA has extended the planetary science missions of eight of its spacecraft due to their scientific productivity and potential to deepen our knowledge.

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A spacecraft has sent back pictures of the sky from so far away that some stars appear to be in different positions than we'd see from Earth.

Data from NASA’s New Horizons mission are providing new insights into how planets and planetesimals – the building blocks of the planets – were formed.

In a fitting tribute to the farthest flyby ever conducted by spacecraft, the Kuiper Belt object 2014 MU69 has been officially named Arrokoth, a Native American term meaning “sky” in the Powhatan/Algonquian language.

NASA’s New Horizons mission team has published the first profile of the farthest world ever explored, a planetary building block and Kuiper Belt object called 2014 MU69.

The Southwest Research Institute will conduct the largest Hubble Space Telescope solar system program ever — a survey of the Kuiper Belt.

The farthest object ever explored is slowly revealing its secrets, as scientists piece together the puzzles of the Kuiper Belt object NASA's New Horizons spacecraft flew past on New Year's Day, four billion miles from Earth.

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The highest resolution images offer about 110 feet (33 meters) per pixel.

New data shows 2014 does not have the snowman shaped it seemed in early images. The larger lobe, nicknamed “Ultima,” more closely resembles a giant pancake and the smaller lobe, nicknamed “Thule,” is shaped like a dented walnut.

The wonders – and mysteries – of Kuiper Belt object 2014 MU69 continue to multiply as NASA's New Horizons spacecraft beams home new images.

Data from NASA's New Horizons spacecraft, which explored Kuiper Belt object Ultima Thule earlier this week, is yielding scientific discoveries daily.

Images of the Kuiper Belt object Ultima Thule unveil the very first stages of solar system's history.

NASA's New Horizons spacecraft flew past Ultima Thule in the early hours of New Year's Day, ushering in the era of exploration from the enigmatic Kuiper Belt.

A schedule of events surrounding the New Horizons flyby of Kuiper Belt Object MU69.

Closest approach takes place in the early morning hours of New Year's Day—12:33 a.m. EST—marking the most distant close exploration of worlds ever completed by humankind.