Arrokoth is a planetesimal in the Kuiper Belt, a vast stretch of space beyond Neptune that holds remnant building blocks of the solar system leftover from our cosmic neighborhood's formation.

A 3-D reconstruction of Arrokoth’s shape indicates that the larger lobe measures 12.8 by 12.3 wide and 5.8 miles thick, while the smaller lobe is 9.6 by 8.6 miles wide and 6.1 miles thick.

On New Year’s Day in 2019, NASA's New Horizons spacecraft radioed to Earth images of the farthest object ever explored: a snowman-shaped primordial object named Arrokoth, one of many frigid ...

Arrokoth, which the New Horizons team nicknamed " Ultima Thule," is one of many frigid bodies way out in the Kuiper Belt, the solar system's "third zone" beyond Neptune's orbit.

Not only did New Horizons achieve a next-to flawless flyby of Arrokoth, the most distant object ever visited, but buried in its gigabytes of data—which have been trickling back to Earth ever ...

Arrokoth, previously named Ultima Thule, was pictured early last year by Nasa's New Horizons spacecraft. Images of the "snowman" released in January 2019 wowed the world – and space scientists ...

Arrokoth previously went by the nickname Ultima Thule. Before that, it was known by the blander name "2014 MU69." "Ultima Thule" was the subject of controversy.

Arrokoth — 4 billion miles from Earth and 1 billion miles beyond Pluto — was chosen because it was reachable and potentially intriguing. The Jan. 1 flyby did not disappoint.

The trans-Neptunian object Arrokoth, also known as Ultima Thule, which NASA's space probe New Horizons passed on New Year's Day 2019, may have changed its shape significantly in the first 100 ...

NASA’s New Horizons spacecraft zoomed past a city-sized object just over a year ago. The most distant object ever explored, since named Arrokoth, was a “planetesimal” lurking quietly in the ...

The surface of Arrokoth, an oddly flat object on the edge of the solar system, may have been boiled away by heat from the sun. This body, more than 6 billion kilometres from the sun in the Kuiper ...

Arrokoth is a planetesimal in the Kuiper Belt, a vast stretch of space beyond Neptune that holds remnant building blocks of the solar system leftover from our cosmic neighborhood's formation.