The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

Although Seeing in the Dark doesn't directly discuss Pluto, it does celebrate the joy of observing planets. Viewers who watch the show may wonder what happened to Pluto in 2006 and whether any of ...

Pluto isn't alone—it's part of the Kuiper Belt with possibly hundreds of other planet-sized objects. Because Pluto hasn't achieved gravitational dominance in its region, the International Astronomical ...

As such, the planets of your friends in order from closest to furthest are as follows: Sadly, there is no love for Pluto in ...

Welcome to this month’s edition of “What’s up in the sky?” February has a nice lineup of planets and some eye-catching ...

Pluto was famously demoted from a full planet to a dwarf planet in 2006. The International Astronomical Union handles the official naming and classification of planets and other celestial bodies.