Watch this video to find out more about the Earth, planets in our Solar System and other planets far ... This allows us to compare the planets in even more detail. Mercury and Venus are both ...

Mars’ strangely small mass still puzzles planetary scientists. Definitive answers as to why are still hard to come by.

Astronomers are searching for a potential ninth planet, known as Planet Nine, which could reshape our understanding of ...

A researcher has used advanced models that indicate that the formation of Pluto and Charon may parallel that of the Earth-Moon system. Both systems include a moon that is a large fraction of the size ...

There may be an undiscovered planet in the outer solar system whose presence is revealed by the strange orbit of objects beyond the eighth planet Neptune. The tantalizing prospect of a ninth ...