It seems 2025 will have a strong start, too, with a planet parade just a few weeks into the new year. A planet parade is when ...

Test your knowledge on our solar system, from the biggest and smallest planets to the behemoth mountain on Mars. When you purchase through links on our site, we may earn an affiliate commission.

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 ...