Voyager 1 has been exploring the cosmos for decades, but when it reached the edge of the solar system, it found something ...

Need a refresher about 3I/ATLAS? Here's everything to know about the interstellar object, including when the latest observations will be made.

The interstellar object hurtling toward the inner solar system, where Earth is located, is much larger than previously thought, astronomers say.

Astronomers found that interstellar object 3I/ATLAS shows an "extreme abundance ratio" of nickel and iron in its gas plume.

Astronomers have discovered fresh evidence suggesting the possible existence of an unseen planet in the far reaches of our ...

A new study suggests yet another theory for a possible extra planet in our solar system, likely of a size between Mercury and ...

While Planet Y has been not yet been directly observed, unexpected inclinations found in the orbits of roughly 50 distant ...

Meet the surprising, oddball worlds moving around our solar system. From meteorites that impact Earth, to a moon that orbits backwards, to an imposter lurking in the asteroid belt, a variety of ...

The asteroid belt may seem permanent, but it is far from static. Its slow decline reveals a more violent past when more ...