A centaur flying into a bunch of trojans sounds like the beginning of a bad joke, but that is exact…

While conducting reconnaissance on their first target — Eurybates — the team was surprised to …

So far three dwarf planets, including the Goblin, have been found in the fringes of our solar …

The semi-major axis is a useful way to measure how far an asteroid is from the Sun on aver…

Antimatter isn't just a sci-fi trope. Ryan Weed has been working on designing an antimatter propuls…

The discovery could rewrite what we know about potentially dangerous space rocks and help better pr…

SpaceX founder Elon Musk said he plans to have a million people on Mars by 2050. Scientists say tha…

The Trojan asteroids have barely changed since the birth of our solar system. NASA's Lucy mission a…

When he discovered Pluto, Planet X became real - for a time. But in 2003, a world larger than Pluto…

Narrator: Now, before you freak out, you should know that our planet isn't about to get sucked up a…

The scientists behind the new study say that direct observations of the mysterious object ⁠- if ast…

But NASA's New Horizons spacecraft has now broken that record, sending back several photos from the…

During the flyby, the probe took a series of images that revealed its shape and spin. The following…

Researchers aren't quite sure of Ultima Thule's exact dimensions. Because it's so dark at roughly 4…

Stern is an ardent defender of Pluto's planethood. In 2015, shortly after New Horizons flew past Pl…

Stern, who recently helped write a book titled "Chasing New Horizons: Inside the Epic First Mission…

Astronomers think 2014 MU69 is about 30 miles across and almost 44 times farther away from the sun …

New Horizons pulled off the maneuver on New Year's Day, taking hundreds of photos in a highly chore…

If this giant "Planet X" exists, we probably haven't spotted it because it's so far away. At such a…

They'll be using the Subaru telescope on the summit of Mauna Kea in Hawaii to hunt it down and sea…