For decades, our solar system was thought to have nine planets, with Pluto considered the smallest and farthest. But in 2006, Pluto was officially reclassified as a dwarf planet by the International ...

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 ...

A recent research paper suggests that a planet may exist far beyond Neptune — less than 20 years after the previous ninth planet, Pluto, was demoted. That research paper, accepted last month for ...

Earth has a newly-discovered neighbor in the solar system. But the heavenly body – possibly a dwarf planet à la Pluto – isn't a frequent visitor. Located beyond Neptune, its extreme orbit ...

In 2006, updated research led to Pluto being controversially demoted to dwarf planet status by the International Astronomical Union. The reasoning was that Pluto's location in the far-flung ...

Full Video- http://www.youtube.com/watch?v=WHNO079G1i8 Pluto, Eris, and the Dwarf Planets of the Outer Solar System Exploring Space Lecture webcast live on Tuesday ...

Astronomers have identified a small but significant possibility that a Neptune-sized planet is quietly orbiting within the ...

A new study suggests yet another theory for a possible extra planet in our solar system, likely of a size between Mercury and ...

The methane gas may constitute a rarefied atmosphere, or it may come from erupting plumes on Makemake’s surface.