There have been questions about a mysterious ninth planet in our solar system for nearly a decade. Pluto was unseated as number nine in 2006. Now, a group of international researchers say they may ...

Explore the Peoria solar system model, where cosmic distances are reimagined in a remarkable scale at the Lakeview Museum. I decided to visit the planet Neptune this winter. Imagine my surprise when I ...

Are planets in the solar system that are closer to the Sun older than the ones further away? – Gavriel, age 10, Paducah, Kentucky A cloud of collapsing gas created our Sun, the first thing to form in ...

There's a little black wooden box in a farm field in Comber, Ont., about 50 kilometres east of Windsor. Spaced at impeccably proportioned distances around it, there are six other little boxes just ...

How Many Planets Are There in the Solar System? There are 8 planets in our solar system. The planets orbit the Sun in elliptical trajectories, and they are all different in size, composition, ...

Astronomers measure the speed at which the solar system is hurtling through space by mapping surrounding galaxies and ...

The Sun is an incandescent but benevolent dictator. For billions of years, it’s kept our star system well organized through the influence of its powerful gravity. All the planets revolve around it on ...

If planet X exists, it is likely a gas giant similar to Neptune. NASA/Caltech/R. Hurt (IPAC), CC BY Our solar system is a particularly crowded place. Millions of objects move within it, whether they ...

All of our solar system’s planets are lining up to parade through the night sky at once. This extraordinary celestial event will see the sky scattered with seven visible planets in what is known as a ...

For every rule in the cosmos, there is a spectacular exception. While most planets orbit in a neat plane, Pluto tumbles at a ...

When I was a kid, there were nine planets. Now we know of thousands! But that includes exoplanets, alien worlds that orbit alien suns. Only eight planets call our solar system home. Or there might ...