"Space snowman" Arrokoth and other Kuiper Belt objects may contain locked-up ancient ice and gas, suggests a new model that could also explain the explosive behavior of "ice bomb" comets passing ...

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.

The New Horizons team announced yesterday that MU69's official name would be “Arrokoth.” Folks, that’s a good name. You may know this rock as the oddly ...

Kuiper Belt Object Arrokoth, the farthest object ever explored by a spacecraft, likely tastes sweet — and soapy.

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 ...

For millennia, the way we found our way home has been using the stars. The tech we have sent towards those stars also uses ...

The space snowman that was the focus of a close encounter with NASA's New Horizons probe is helping scientists answer questions about the early stages of planetary formation.

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 ...

In Arrokoth's case, those shorter molecules appear to include methanol, a single-carbon alcohol and the only individual chemical clearly identified in the New Horizons data.

A new study from researchers at the Southwest Research Institute has unearthed a fascinating discovery about Arrokoth, a trans-Neptunian object made famous by the New Horizons probe in 2020.