On the 95th anniversary of its discovery, Pluto remains one of the most beloved and enigmatic worlds in our solar system, ...

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 ...

Pluto was demoted from a planet to a dwarf planet in 2006. So why is its status still so controversial today? ... It must have enough mass to draw itself into a round shape.

Pluto was considered a planet for 76 years, but it's not. ... Essentially, van Belle said, the committee defined a planet as a mass that generates the gravity necessary to form a ball.

However, those hoping Pluto might get to become a card-carrying planet again will be disappointed – its mass is just shy of the cut-off, while Mercury manages to scrape through.

According to a recent YouGov poll, 35% of Americans think Pluto is not a planet. But they are all wrong—kind of. To get to the bottom of whether Pluto is a planet, I tracked down planetary ...

That’s why the team put an upper bound on mass in their definition of a planet. And in case you’re wondering, Pluto weighs approximately 2.89*10 22 (1.31*10 22 kg).

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.

Pluto was demoted from a planet to a dwarf planet in 2006. So why is its status still so controversial today? ... It must have enough mass to draw itself into a round shape.