Add Yahoo as a preferred source to see more of our stories on Google. Hey, remember Pluto? Of course you do! When most of us were brought up in school we learned that there were nine known planets in ...

Then there were 8. This morning, the International Astronomers Union stripped Pluto of its planet status, citing new guidelines for what constitutes an actual planet. It will now be considered a Dwarf ...

No longer a planet but not forgotten, Pluto’s colors, captured by NASA almost 10 years ago, continue to dazzle among the collection of colorful celestial objects only seen in the solar system. Since ...

Pluto reaches opposition at 3 A.M. EDT. Opposition is when objects typically appear at their best, and with no Moon in the sky, observers with large scopes and little light pollution may be able to ...