NASA’s most recent photos of Pluto, captured by the New Horizons spacecraft, have revealed some of the most intriguing and ...

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

Many planet classification schemes have been proposed ... These bodies were approximately the size of Pluto, which was then considered a planet. With a new definition, the small worlds and Pluto ...

When this happened, Alan Stern, the principal investigator behind the New Horizons Pluto fly-by mission, was not very amused. Our current classification system of what makes a planet a planet just ...

Both Morison and Byrne agree the IAU classification has had a scientific impact, and think Pluto and similar bodies should be classified as planets. But “it’s not particularly crucial ...

Pluto should be reclassified as a planet ... Instead, Metzger recommends a planet classification based on whether it is sufficiently large so that its gravity allows it to become spherical ...

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

The newly discovered object, named 2017 OF201, has a 25,000-year orbit and is believed to be a large contender for dwarf ...

There’s a new frozen oddball orbiting the Sun, and it’s not your average space rock. It’s a planet—a minor one, to be ...

Why Pluto Doesn't Fit "Pluto is a dwarf planet. So be it — it's a classification," says Thierry Montmerle, the group's general secretary. "It's not a demotion or a promotion." He says Pluto ...

A new dwarf planet, discovered beyond Neptune and described as Pluto's 'cousin,' could void the hypothesis of a Planet X in ...