It took over nine years for New Horizons to reach Pluto after blasting off atop an Atlas 5 rocket on Jan. 19, 2006. After ...

It was one of the most ambitious missions for NASA since the turn of the century, with photos reshaping what scientists know ...

At the far reaches of our Solar System lies Pluto, a mysterious world shrouded in shadows and icy terrain. NASA’s latest ...

What if there’s a planet hiding in our solar system, 10 times larger than Earth? While this theory has yet to be confirmed, ...

Close stellar encounters could change the structure of our planetary system, potentially dooming Earth or other worlds to ...

Over the past decade, researchers have been puzzling through Pluto’s mysteries. Meanwhile, the New Horizons probe heads for interstellar space.

While for most people Pluto is the most distant planet in the Solar System, things get a lot more fuzzy once you pass Neptune ...

Sedna, a distant dwarf planet three-quarters the size of Pluto, is inching toward the brightest star in our sky — and in 2076 ...

Astronomers have discovered yet another alien visitor to the Solar System.

How long does it take Pluto to orbit the sun? Learn more about how this planet makes one lap around our Solar System.

Astronomers have observed an object that originated from beyond our solar system, thought to be an interstellar comet, ...

Sedna will reach its closest approach to the Sun in 2076, providing a remarkable space-faring opportunity that won’t come ...