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.

Giant planets are not rare per se — after all, we have four in our own solar system. Such large worlds are, however, rarely ...

Plus, an in-depth look at how the West Texas city of Seminole reacted when a measles outbreak tore through the region.

A possible new dwarf planet has been discovered at the edge of our solar system, so far-flung that it takes around 25,000 ...

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

The TNO is potentially large enough to qualify as a dwarf planet, the same category as ... empty section of space thought to exist beyond Neptune in the Kuiper Belt is not, in fact, empty at ...

New dwarf planet discovered beyond the orbit of Neptune James Webb telescope discovers frozen water around alien star Jupiter is shrinking and used to be twice as big, mind-boggling study reveals ...

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"Social media was flooded with memes and witty comments, some of which also highlighted that Pluto’s designation as a "dwarf planet" does not negate its planetary essence. One user insightfully ...

Kirk to bend Trump’s ear toward Pluto. Getty Images The now-dwarf planet was first discovered in 1930 by Clyde W. Tombaugh, an Illinois native, at Lowell Observatory in Flagstaff, Arizona.

The International Astronomical Union, which reclassified Pluto as a dwarf planet in 2006, is the arbiter of such classifications. Andrea has written about NASA and the commercial space sector ...

The smaller of Mars' two moons shines in the sky before sunrise on the Red Planet, as captured by NASA's Perseverance rover. NASA's Perseverance rover captured this pre-dawn view of Mars' moon ...