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

Elon Musk, under the username "Kekius Maximus," has joined William Shatner in advocating for Pluto's reclassification as a planet. Shatner playfully suggested Musk persuade the President via executive ...

A recently discovered celestial body is rewriting our knowledge of the Kuiper Belt and maybe challenging the existence of the ...

Almost 20 years after Pluto was infamously downgraded from its status as a planet, scientists now believe they have ...

In the time Pluto was found, classified as a planet and reclassified as a dwarf planet, it has not completed one orbit. One year on the distant ice planet is 248 Earth years, and one day is 153 ...

Astronomers have voted to strip Pluto of its status as a planet. About 2,500 scientists meeting in Prague have adopted historic new guidelines that see the small, distant world demoted to a secondary ...

Originally classified as the ninth planet from the Sun, Pluto was recategorized as a dwarf planet and plutoid due to the discovery that it is one of several large bodies within the newly charted ...

Pluto (L), pictured with its largest moon, Charon, is now a dwarf planet A fierce backlash has begun against the decision by astronomers to strip Pluto of its status as a planet. On Thursday, experts ...

Charon is large in size relative to Pluto, and is locked in a tight orbit with the dwarf planet. A new simulation suggests how it ended up there. By Jonathan O’Callaghan Some 4.5 billion years ...