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

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 ...

For most of January, four of the eight planets in our solar system (sorry, Pluto) will be visible if the sky is clear enough at night, IFLScience reports. Well, five if you're one of the astronauts ...

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.