Charon is the largest moon of the dwarf planet Pluto, but calling it a moon ... When the New Horizons spacecraft flew past Pluto and Charon in 2015, it imaged only one side of Charon.

Explore Ceres, the largest asteroid in our solar system, and discover its remarkable ancient ocean and ice-rich crust.

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

However, in 2006, the International Astronomical Union (IAU) redefined what constitutes a planet, leading to Pluto’s reclassification as a dwarf planet. This decision sparked widespread debate ...

A new study suggests that the origin of Pluto's largest moon was quite different than our own. Here's what you need to know.

One idea is that Pluto got its moon system when a massive object smashed into the dwarf planet. The resulting debris then formed into the moons. This hypothesis was nicknamed the “Big Whack.” ...

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

Pluto, our planet of profound change and ultimate reckoning, has set up shop in Aquarius, and the energy of the dwarf daddy of death’s transit will have a weighty effect on all of us.