At the far reaches of our Solar System lies Pluto, a mysterious world shrouded in shadows and icy terrain. NASA’s latest photos from this distant dwarf planet have provided us with ...

NASA said it’s the largest known glacier in our solar system. Images of Pluto’s icy heart have appeared on screensavers and T-shirts and have been shared by news media worldwide.

Though Pluto has formally been considered a dwarf planet for almost two decades, it still has many lessons left for planetary scientists — including hints about how the solar system formed.

A recent research paper suggests that a planet may exist far beyond Neptune — less than 20 years after the previous ninth planet, Pluto, was demoted. That research paper, accepted last month for ...

It’s the solar system’s only binary planet system, even though Charon isn’t technically a planet, he said. Pluto, too, is no longer considered a full planet.

Based on this definition, there could be nearly 110 planets in the solar system, including both Jupiter’s and Earth’s moons.