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

For decades, Pluto was celebrated as the ninth planet of our solar system. However, in 2006, the International Astronomical ...

According to a recent YouGov poll, 35% of Americans think Pluto is not a planet. But they are all wrong—kind of. To get to ...

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

How to pack for Pluto? 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 ...

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 ...

As they separated and this icy kiss ended, the team thinks that Pluto would have torqued Charon into a close, higher circular orbit from which the moon would have migrated outward. "The 'kiss' in ...