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 ...

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

Skywatchers: A six-planet alignment peaks this week as Mars, Jupiter, Uranus, Neptune, Venus, and Saturn come together for view shortly after sunset in the sky.

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 ...

Artistic representation of the huge and slow impact on Pluto that led to the heart-shaped Sputnik ... [+] Planitia structure on its surface. Ever since NASA's New Horizons sent back the first-ever ...

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.