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 ...

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 ...

OF201 is incredibly lightweight on a cosmic scale. Scientists estimate its mass is about 20,000 times less than Earth’s and ...

then Pluto, Haumea, Makemake and Eris, which all orbit beyond Neptune. The organisation defines a planet and a dwarf planet differently. A planet must orbit its host star – in our case the Sun ...

It had not been thought possible that such tiny, weak stars could provide the conditions needed to form and host huge planets.

Dozens of NASA's missions to explore the cosmos could be in jeopardy under a budget proposal from the Trump administration.