The idea that our nine-planet solar system may soon join the obsolete world of slide rules is sending teachers, textbook writers and toymakers back to the drawing board. IE 11 is not supported.

Space Museum is a Kickstarter desk display that let you compare gravity on different planets in our Solar System.

Rare "in-sync" solar system discovered by scientists 04:12. Astronomers have discovered a rare in-sync solar system with six planets moving like a grand cosmic orchestra, untouched by outside ...

Almost 20 years after Pluto was infamously downgraded from its status as a planet, scientists now believe they have discovered a new planet in our solar system.

Our solar system may have a ninth planet after all, following the declassification of Pluto nearly two decades ago, researchers say. ABC News. Live. Video. Shows. Shop. Log In. Stream on.

Astronomers have discovered 12 new moons around Jupiter, pushing it past Saturn as the planet in our solar system with the most moons — a whopping 92. Feb. 6, 2023 ...

Astronomers using planet-hunting satellites have discovered a rare solar system with six planets moving completely in sync with one another, as if they were untouched by any outside force since ...

Though Pluto has formally been considered a dwarf planet for almost two decades, it still has many lessons left for planetary scientists — including hints about how the solar system formed.