A sweeping new ICE operation shows how Donald Trump’s focus on immigration is reshaping federal law enforcement.

As a result of the International Astronomical Union’s 2006 demotion of Pluto from planet to dwarf planet, our solar system ...

For the dwarf planet candidate, one trip around the sun takes over 24,000 years. Its orbit challenges a proposed path for a hypothetical Planet Nine.

For the unversed, "Planet Nine" is a hypothetical planet which is reportedly larger than Earth that is thought to orbit ...

Discovery of 2017OF201, a large trans-Neptune Object, challenges previous beliefs about the Kuiper Belt and hints at the ...

The five dwarf planets recognized by the International Astronomical Union are Pluto, Ceres ... implications for understanding our solar system beyond the known planets—and the search for ...

If you could travel in a straight line at highway speed (approximately 60 mph or 100 km/h), the drive to Pluto, which is the outermost farthest-out dwarf planet that defines the edge of our solar ...

Researchers found the object named 2017 OF201 while searching for "Planet Nine" - a hypothetical planet thought to exist ...

Scientists have identified an object about 700km wide inhabiting the frigid outer reaches of our solar system that might ...

By Kenneth Chang Kenneth Chang has been reporting on dwarf planets and their definitions since Pluto was demoted into that category. A sizable world has been found in a part of the solar system ...

Scientists have discovered a colossal object approximately 435 miles wide in the frigid outer reaches of our solar system, ...

A potential new dwarf planet has been ... similar to Pluto's orbit." We're learning more and more about the outer solar system. Beyond Neptune is the Kuiper Belt; a ring of icy cometary nuclei ...