Topic: Alan Stern

NASA scientists with the New Horizons team have renamed MU69, a Kuiper Belt asteroid. The space rock's new moniker is Arrokoth.

Ultima Thule is flatter than scientists originally thought.

Astronomers have for the first time identified a kilometer-sized object at the edge of the solar system.

NASA has released the most high-resolution image of Ultima Thule captured by the space agency's New Horizons probe.

New images and data returned by the New Horizons probe prove Ultima Thule is a snowman-shaped contact binary, the first to be explored by a spacecraft.

NASA's New Horizons probe rang in the new year by swinging by Ultima Thule, a small object in the Kuiper asteroid belt.

NASA's New Horizons spacecraft is making its final approach to the Kuiper Belt, with plans to perform a historic flyby of Ultima Thule on New Year's Day.

This week, the last of the data collected and beamed back by the New Horizons probe was downloaded by engineers at the Johns Hopkins Applied Physics Laboratory.

On Friday, NASA released the clearest close-ups of Pluto yet. The high-resolution images were captured by the New Horizons probe during this summer's flyby.

The new images include additional close-ups of Pluto's rugged beauty -- the sphere's surface features revealed in new range and detail.