The International Astronomical Union’s Minor Planet Center, which catalogs new moons and other small bodies in the solar ...

It's an evocative idea that has long bedeviled scientists: a huge and mysterious planet is lurking in the darkness at the ...

It is an evocative idea that has long bedevilled scientists: a huge and mysterious planet is lurking in the darkness at the ...

Astronomers have discovered a mysterious dwarf planet, 2017 OF201, far beyond Pluto. This discovery challenges existing ...

Scientists have discovered a mysterious new object far beyond Neptune, and it could be one of the most distant dwarf planets ...

Astronomers find evidence of a possible ninth planet beyond Neptune, reigniting the debate about the formation of the Solar ...

Scientists believe such an extreme orbit means the object was pushed and pulled by the gravity of giant planets like Jupiter ...

There’s a new frozen oddball orbiting the Sun, and it’s not your average space rock. It’s a planet—a minor one, to be ...

Pluto’s demotion ... a new planet hiding beyond Neptune. Two astronomers in Japan, Patryk Sofia Lykawka and Takashi Ito, claim there is a planet a little larger than Earth lurking in the Kuiper ...

Cheng, together with graduate students from Princeton University, discovered the potential dwarf planet while searching for ...