Astronomers declared Pluto a planet in 1930, but its weak gravity couldn’t fully explain Neptune’s orbital wobbles. Scientists kept searching, and by the 1990s they were busy discovering many ...

Today in the history of astronomy, our solar system's ninth member is downgraded to a dwarf planet.

At just two-thirds the diameter of our moon, Pluto has such weak gravity that your baseball could clear the 455-foot-tall Great Pyramid of Giza — with room to spare.

On August 24, 2006, Pluto ceased to be considered a planet. A mixture of rock and ice located in the Kuiper Belt, a region of icy objects beyond the orbit of Neptune. This demotion ...

Once believed to be the ninth planet from the sun, Pluto lost its planet status in 2006 — causing controversy both scientifically and culturally.

Modelling Pluto's atmosphere as that of Mars on a very much back of envelope system of e, gravity, ratios and guesstimates, I get a mass of 10-35 teratonnes at perihelion, which is a little ...

Pluto reaches opposition and is ready for those who want to chase it down. Use the biggest scope you've got, or take aim with a photo-capable smartscope.

Pluto’s gravity is so weak that a man weighing 300 lbs. (136 kg) on Earth would weigh just 20 lbs. (9 kg) on Pluto • Unfortunately, breathing would be impossible.

Nix and its fellow small moons Kerberos, Styx and Hydra wobble because they're embedded in the strong-arm gravity field of the Pluto-Charon duo .

Persephone would study the shape of Pluto to hunt for signs of a telltale fossil bulge — a "beer belly" of sorts caused when gravity pulls on the mass of a world. Bulges form more easily when the ...