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 ...

But why isn't Pluto considered a planet anymore ... is not the gravitationally dominant object in its neighborhood — and thus, not a planet, according to the new definition.

In fact, Charon and Pluto are so similar in size that they are considered a double dwarf planet system, not a planet and moon. Charon is smaller than Earth's moon. In fact, Pluto is smaller than ...

This mysterious ninth planet could be found within the next ‘two years’, one expert said (Picture: Getty Images/iStockphoto) We’re closer than ever before to knowing whether there is a ninth ...

For decades, astronomers have tried to determine how Pluto acquired its unusually large moon Charon, which is about half the size of the dwarf planet ... She was not involved in the new research.

Charon is large in size relative to Pluto, and is locked in a tight orbit with the dwarf planet. A new simulation suggests how it ended up there. By Jonathan O’Callaghan Some 4.5 billion years ...