Filmmaker Adam Nemoy helps celebrate the 90th anniversary of Pluto's discovery this month at the 6th annual 'I Heart Pluto' ...

Scientists at NASA for the first time have been able to observe the make up of Pluto and other small and icy celestial bodies ...

Pluto isn't alone—it's part of the Kuiper Belt with possibly hundreds of other planet-sized objects. Because Pluto hasn't ...

With girded loins, gritted teeth and a brave heart, folks. Pluto’s orbit is arduously long, with the planet changing signs once every twelve to thirty years. Pluto’s residency in the ivory ...

In August 2006, the International Astronomical Union made the controversial, but correct, decision to demote Pluto from its ...

The IAU shook the world in 2006 when it took Pluto's status as a planet away. According to the IAU, to be a planet, you must do all of the following: Orbit the sun. Have enough mass for your own ...

These popular astronomy questions, answered by Astronomy magazine, will help you better understand our universe - and share ...

Take advantage of a special 6-7 planet alignment from Earth's perspective. Planets 'line up' in the skies over California in ...

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

At the time, Pluto was assumed to be a planet due to its orbit around the Sun, despite being much smaller than initially believed. The name "Pluto" was suggested by Venetia Burney, an 11-year-old ...

Whereas a moon usually orbits a planet, both Pluto and Charon orbit a point in space between them — their common center of mass. The other four moons in the system — Styx, Nix, Kerberos and ...