Its inclined orbit challenges current models of the outer Solar System. Discovered by an international team, this object ...

Is there a massive undiscovered planet on the outer reaches of the Solar System? The idea has been around since before the ...

Researchers use the Subaru Telescope in Hawaii to find a small object on the outer edge of the Solar System. Nicknamed ...

Ammonite was discovered using the Subaru Telescope in Hawaii, with follow-up confirmation from the Canada-France-Hawaii ...

Planet Nine should appear stationary over the course of a single day but show detectable movement over months.

For reference, Pluto’s average distance from the Sun is about 40 AU, so 2023 KQ14 is quite distant. At 23.4 billion miles (37 ...

The newfound exoplanet, called Kepler-139f, is a gigantic world roughly twice the mass of Neptune and 35 times the mass of ...

In the remote outer reaches of planetary systems, far beyond the orbit of known planets, enormous and mysterious worlds silently loop around their stars. Some drift as far as 10,000 times the ...

The planets of the solar system were lined up in the sky Wednesday night in an astronomical phenomenon, visible from Earth, known as a "planet parade." The phenomenon, which was also visible ...