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.
Learn more about NASA's New Horizons mission, which performed history's first flyby of the Pluto system on July 14, 2015.
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.
It's time to say goodbye to one of the most storied explorers of our age: Voyager 2 has entered interstellar space.
NASA is starting scientific observations of a new asteroid called Bennu today (Dec. 3), kicking the OSIRIS-REx mission into full gear.
Four months ago, people in a small Madagascar town caught sight of a fireball shooting across the early-evening sky. Its boom was so loud, the ground shook.
The history-making interstellar visitor 'Oumuamua is a relatively small and reflective object, a new study suggests.
There appears to be a cold "super-Earth" planet circling Barnard's Star, which lies just 6 light-years from the sun. Here's what you should know about the newfound planet candidate.
Astronomers have found compelling evidence of a frigid alien world about 3.2 times more massive than Earth circling Barnard's Star, a dim red dwarf that lies just 6 light-years from the sun.
Vega, historically one of the most-studied stars, is under scrutiny in modern times because it may have planets.
Scientists are one step closer to understanding why some comets have strange dust bands in their tails. The main culprit in this cosmic mystery? Our own sun.