The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

The red planet While we don’t have images of many of the planets in the solar system since they’re too far away, we do have a selection of images of Mars, including this beauty that reveals ...

All seven of the other planets in our solar system are about to become visible at once in a great planetary alignment – here’s how to spot the celestial show ...