On the 95th anniversary of its discovery, Pluto remains one of the most beloved and enigmatic worlds in our solar system, whether you call it a planet or not.

Because then, as you decrease the mass of the sun, the mass ratio of Pluto, whatever you want, to the sun becomes a huge number. Then things, even not very massive things start acting like planets.

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.

Astronomers had found Planet X, now called Pluto (after the Roman god of the underworld). However, after analyzing the new planet’s orbit, astronomers declared Pluto had too little mass to ...

We’ve learned that the most common mass/size combination for a planet is intermediate between Venus/Earth and Uranus/Neptune: ... The 8 planets of the Solar System are all in; Pluto is clearly out.

Group of scientists published 5-year study arguing the current definition of planet was rushed, and should include Pluto, along with 100 other celestial bodies.

It’s now believed that Planet 9, if it exists, will be about half the mass of Uranus. Maybe that doesn’t sound like much, but it’s more than the combined heft of Mercury, Venus, Earth and Mars.

An impact early in Pluto’s history would have created a mass deficit, causing Sputnik Planitia to slowly migrate toward the dwarf planet’s north pole over time while the planet was still forming.

Pluto was considered the ninth planet# in our solar system up until 2006 when the## International Astronomical Union reclassified# the status of Pluto as a dwarf planet.