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

The small world was found during a search for the hypothetical Planet Nine, and astronomers say the next time it will reach ...

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

U.S. astronomers hunting for "Planet Nine" have instead stumbled on what appears to be a new dwarf planet in the solar system's outer reaches.

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

In the cold, distant reaches of the Solar System, far beyond Pluto, astronomers have just identified what could be a new ...

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

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 ...

Astronomers have found a large world of ice and rock circling the Sun beyond the most distant planet ... But that is not to say that a new planet could not be found. Experts say there could be a Pluto ...

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