Our Solar System has eight planets, a few dwarf planets and more than 200 moons. But wait. Are you seeing double? Or did ...

Scientists believe there are planets outside our solar system where life is even more abundant and sustainable.

As far-fetched as it may seem, quirks of orbital mechanics could allow hundreds of planets to be packed around a star ...

A new machine learning model has predicted that there are 44 Earth-like planets in other star systems in the Milky Way galaxy, with researchers from Switzerland claiming that the algorithm at the core ...

Earth and Mars may have formed through very different processes, despite developing as neighbors in the early solar system.

Our solar system is a smashing success. A new study suggests that from its earliest period—even before the last of its nebular gas had been consumed—Earth's solar system and its planets looked more ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. After decades of ...

Several decades ago, we thought the solar system had nine planets. Then Pluto was reclassified as a dwarf planet. And then astronomers realized the solar system is full of dwarf planets. Recent ...