and it must have cleared its orbital path of debris. Pluto meets the first two requirements, but the third it does not. While ...

The Sun is the largest object in the Solar System. The Sun’s huge gravitational field keeps many other objects – planets, dwarf planets, asteroids and comets – in orbit around it.

As the gatekeepers to the Kuiper Belt, Charon and Pluto are a unique double dwarf planet system ... Knowing Charon's orbital period meant that astronomers could calculate good estimates of ...