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

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.

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

At the time, astronomer Jerry Ehman spotted the highly unusual outburst in printed out records, annotating the major radio ...

Interstellar comet 3I/ATLAS is just the third such object ever confirmed to have entered our solar system. It has attracted ...

The comet is one of only three of its kind recorded in history. But others think there could be more to this celestial object.

The interstellar visitor, known as 3I/ATLAS, was photographed by a spacecraft orbiting the red planet last week.The European ...

Created by the sun, the protective bubble of the heliosphere shields our solar system from harmful radiation. A new mission ...

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

3I/ATLAS, an interstellar object currently zipping through the solar system, is capturing the attention of astronomers, the ...