Test your knowledge on our solar system, from the biggest and smallest planets to the behemoth mountain on Mars.

Widespread magnetism dating from our solar system’s earliest beginnings some 4.57 billion years ago likely played a major role in creating orbital order out of chaos. But until now, magnetism ...

Jupiter, the largest planet in the solar system, will be visible to sky gazers on Earth. Here’s when to look out for it and ...

Everyone knows about the Solar System, and the planets that make it up. They’re in space, orbiting the Sun, in an order we all at least used to be able to recite. But it was not always so.

Maddie Moate:Oh that looks like fun. Can you remember the right order of theplanets? Our solar system is huge and it's just one of nearlynearly 4000 star systems in our galaxy, the Milky Way.

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 ...