The celestial body's unusual orbit “implies that something extraordinary occurred" in the early days of the solar system—and ...

Astronomers have discovered "Ammonite," a mysterious object on the solar system’s edge whose unusual orbit challenges current ...

Would one frozen world, just visible on the rim of the Sun’s kingdom, turn decades of speculation on the concealed layout of ...

Typically, telescopes are synonymous with bringing far-off objects close, but the newest member of the solar system was discovered using wide-field imaging. The Subaru Telescope has spotted a distant ...

Learn more about a sednoid called Ammonite that has been detected in the outer reaches of the Solar System.

After digging through the Ingot Isle Cave-In and teaming up with a singing Odd Rock, Donkey Kong dives deeper into the earth ...