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 ...

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 ...

Our solar system may have a ninth planet after all, researchers say. The possibility that an additional planet may be hidden far into the solar system was touted more than a century ago. But ...

If you’d like to see all the planets of our solar system, this is a good week to do so. Step outside at dusk and you’ll notice the most obvious of planets in the southwestern sky. I’m referring, of ...

Add Yahoo as a preferred source to see more of our stories on Google. Digital art of distant planet - Dottedhippo/Getty Images On August 24, 2006, our solar system lost a planet. It wasn't by ...

The Solar System is a weird place filled with incredible physics and geological oddities that often break down in human terms ...

Made up of billions of objects, the Solar System has been studied for generations - but there is still so much to learn about it. Full of celestial bodies orbiting the Sun, the Solar System is roughly ...