On Jan. 1, 2019, NASA's New Horizons spacecraft will make history with the first close flyby of a Kuiper Belt object: Ultima Thule. See photos of Ultima Thule and the historic encounter here!
Learn more about NASA's New Horizons mission, which performed history's first flyby of the Pluto system on July 14, 2015.
As 2018 draws to a close, one group of people plans to celebrate something far more unusual — a flyby of Ultima Thule, the most distant solar system object ever explored. Here's what to expect.
As NASA's New Horizons probe nears its second target, we investigate what's lurking at the edge of the solar system.
NASA's New Horizons spacecraft is about the make the most distant planetary flyby in the history of spaceflight, and you can follow the action live.
At 12:33 a.m. EST on Jan. 1, 2019, a robotic emissary of humankind will fly past a never-seen-before world in the outer solar system. Here's how to watch with mobile apps.
New Horizons principal investigator Alan Stern discusses the mission and its Jan. 1 flyby of the mysterious, distant object Ultima Thule.
There's something weird going on with Ultima Thule, the distant object that NASA's New Horizons spacecraft will fly by just 10 days from now.
The United States government just shut down for the third time this year, and a lot of NASA employees will be staying home as a result.
NASA's history-making New Horizons spacecraft may not be done with deep-space flybys after its highly anticipated New Year's Day encounter.
The free Pluto Safari app let New Horizons fans track the probe's flyby of Pluto in 2015, and now it's set to follow the journey past the distant body Ultima Thule on New Year's Day.
NASA's New Horizons spacecraft will indeed get very close to the mysterious, distant object Ultima Thule on New Year's Day.
A newly discovered object is the most-distant body ever observed in the solar system — and the first object ever found circling at more than 100 times the distance from Earth to the sun.
Call it a cosmic coincidence: Two probes launched four decades apart, traveled in opposite directions — and ended up using similar instruments to gather milestone data on precisely the same day.
Voyager 2 has passed an incredible milestone in its journey to explore the solar system by entering interstellar space, but neither its travels nor its science are ending any time soon.
The icy Saturn satellites Dione and Rhea do their best impression of a snowman in a newly released photo captured by NASA's late Cassini spacecraft.
NASA's New Horizons probe is getting set for the farthest-out flyby in history, and you can send some words of encouragement to help the spacecraft get across the finish line.
The small object Ultima Thule swims amid a sea of distant stars in a new photo captured by NASA's approaching New Horizons around midnight EST (0500 GMT) on Dec. 1.