Critics counter that Ceres, which is only 580 miles wide, was oly considered a planet for a year, while Pluto has been a major planet for more than 70 years. In addition, they say, there was ...

Pluto has had a pretty interesting past few decades. Long considered the ninth official planet, astronomers who redefined what “planet” really means decided to reclassify Pluto in 2006 as a ...

Planet-Like Ball Spied Beyond Pluto Astronomers have discovered a giant ball of ice and dust in orbit around the sun, far beyond Pluto. Scientists say it's the most distant object in our solar ...

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.

The issue of whether Pluto should be a planet first arose in the 1970s, ... "if you have a foul ball, it's because the ball landed on one side of the line—that's pretty clear.

The James Webb Space Telescope (JWST), operated by NASA, has uncovered intriguing new details about Charon—Pluto’s largest ...

When NASA's New Horizons spacecraft flew past Pluto in 2015, it shattered the notion that the dwarf planet was a dormant ball of ice, instead revealing it to be rich with icy plains and jagged ...

Sedna will make its closest approach to the Sun in 2076, giving us a rare opportunity to visit the planetoid before it drifts ...

In the end, the ball on Pluto would travel 16 times farther than on Earth. The video plays out in "real time," showing how long each ball throw would take, O'Donoghue said. On Pluto, it takes a ...