Extras
Ultima Thule is Surprisingly Flat
This discovery could have a big effect on how scientists think about planet formation.
Ultima Thule is Surprisingly Flat
Days Before Flyby, Ultima Thule Still Mysterious
NASA's New Horizons spacecraft is about to visit the most distant object ever explored.
Days Before Flyby, Ultima Thule Still Mysterious
New Horizons Makes Historic Flyby on New Year's Day
The New Horizons spacecraft made history by conducting the farthest ever flyby.
New Horizons Makes Historic Flyby on New Year's Day
The New Horizons spacecraft zooms toward an object 4 billion miles from Earth.
Pluto and Beyond Preview
Ultima Thule Comes Into Focus as New Images Reveal Secrets
NASA scientists received the most detailed images from its spacecraft, New Horizons.