On August 24, 2006, our solar system lost a planet. It wasn't by cataclysmic destruction, but rather by the vote of the International Astronomical Union, which declared that Pluto, considered the ...

The solar system may have a ninth planet after all. This one is 5,000 times bigger than outcast Pluto and billions of miles farther away, say scientists who presented "good evidence" for a ...

Does our solar system have a mysterious ninth planet? The discovery of a new dwarf world suggests not – Copyright AFP Eyad BABA It’s an evocative idea that has ...

Dwarf planet Pluto was discovered by American astronomer Clyde Tombaugh. Pluto was long considered the 9th planet in the solar system, but the International Astronomical Union reclassified Pluto as a ...

Scientists reported Wednesday they finally have "good evidence" of Planet X, a true ninth planet on the fringes of our solar system. The gas giant is thought to be almost as big as Neptune and ...