After a decade-long search, some scientists say a growing number of clues point to the existence of a hidden planet in the ...

Beyond Neptune lies the Kuiper Belt, a vast region of icy bodies that holds the secrets to the solar system’s formation.

astronomers Scott Sheppard and Chadwick Trujillo observed similar anomalies in trans-Neptunian object orbits, suggesting that ...

so it’s not so crazy to have another planet within the same system.” The most promising path forward, she added, is actually finding more of the trans-Neptunian objects that Batygin is basing ...

An international team, including UNIGE, has unveiled the "Neptunian ridge," an overabundance of Neptunes nestled between the ...

Located 690 light years away from the Sun, the newest discovered planet is third most dense sub-Saturn class located at the ...

There may be an undiscovered planet in the outer solar system whose presence is revealed ... and some odd objects that astronomers call Trans-Neptunian Objects. One of the TNOs is Sedna, an ...