Only eight planets call our solar system home. Or there might still be nine if some astronomers are correct about an as-yet undiscovered large body out past Neptune.

All of our solar system’s planets are lining up to parade through the night sky at once. This extraordinary celestial event ...

The eight planets in our solar system orbit the sun in roughly the same plane, because they all originally formed from the same disc of debris around the sun.

Don't worry though—it's not like one planet simply fell out of the solar system. We'll explain what happened and also show you some tricks for remembering the order of all of the planets that ...

Without it, Thomas says "we would not exist" and "our solar system would not have formed as it has today." The Earth takes 365 days to orbit the sun. It moves through each zodiac sign for about a ...

The Sun is orbited by eight planets, at least five dwarf planets, tens of thousands of asteroids, and around three trillion comets and icy bodies. Although not all objects of the solar system are ...

Our solar system – which includes the Sun, eight planets, five dwarf planets, hundreds of moons and millions of asteroids, comets, and meteoroids – has been the centre of studies covering a ...

Seeing the Solar System all in one night is a real eye-opener, but some of the planets aren’t easy to find. However, at least five of them are fairly straightforward, and that’s not a bad haul ...

Our solar system was long considered a template for all planetary systems. In the last 25 years, however, it has quickly and firmly become an outlier for lacking its own super-Earth. NASA's ...

A cloud of collapsing gas created our Sun, the first thing to form in our solar system. This happened about 4½ billion years ago.. Then the planets began to emerge, as the billions of particles ...