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

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.

James Webb Space Telescope observations suggest Pluto’s atmosphere is unlike any other in the solar system, confirming a 2017 ...

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

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

In the last few years, we have started to realize that the dwarf planets beyond Neptune are just as ... the object that cost Pluto its planetary status, said in a tweet that the naming will ...

The TNO, which are described as minor planets that orbit the sun at a greater distance than Neptune, were found on the edge ...

Astronomers announced the discovery of a new dwarf planet, provisionally named 2017 OF201, located in the remote outskirts of ...

Scientists have identified an object about 435 miles (700 km) wide inhabiting the frigid outer reaches of our solar system that might qualify as a dwarf planet, spotting it as it travels on a highly ...

Since its discovery in 1930, Pluto was well-known as the ninth planet in the solar system, far beyond Neptune ... declared that the faraway orb was a dwarf planet due to its location, known ...

The International Astronomical Union reclassified Pluto as a dwarf planet because it does not ... with its icy surface and distant orbit beyond Neptune. But in 2006, Pluto’s planetary reign ...

After several months, he successfully located a round, rocky object beyond Uranus that he ... Regardless of whether Pluto is a planet or a dwarf planet, it remains a fascinating part of the ...