Many people hold Pluto close in their hearts and refuse to abandon the assertion that it is a planet, although science ...

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.

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 ...

an underdog among its much larger planetary siblings of the inner planets and the gas giants beyond the asteroid belt." ...

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 ...

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 ...

Why can’t planets orbit planets? The debate over Pluto’s status highlights the evolving nature of scientific classification. Definitions should reflect our growing understanding rather than ...

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 ...