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

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

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 ...

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

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

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