The double star system is called HD 135344 AB and it's about 440 light-years away from Earth. A and B are both young stars, ...

For decades, our solar system was thought to have nine planets, with Pluto considered the smallest and farthest. But in 2006, Pluto was officially reclassified as a dwarf planet by the ...

Close stellar encounters could change the structure of our planetary system, potentially dooming Earth or other worlds to ...

If you are a budding astronomer or simply enjoy watching the sky through a telescope, you probably have an interest in all of the planets in our solar system.

All eight of the solar system’s “major” planets appear in this illustration, but the actual number of planetary bodies orbiting our star is far greater.

Will there ever be a time when all the planets of our solar system line up in a row, one behind the other, as seen from Earth? Ian Christie Melbourne, Australia The short answer is no.

Curious Kids is a series for children of all ages. If you have a question you’d like an expert to answer, send it to [email protected]. Are planets in the solar system that are ...

Scientists may have discovered a dwarf planet far beyond Neptune — an unearthing that may disprove a longstanding theory ...

That path is called the ecliptic, and it exists because all planets in our solar system orbit around the sun on roughly the same plane.

The flares may heat up and inflate the planet's atmosphere, which is dominated by hydrogen and helium. Being lashed by these ...

The planets, sun and moon have significant meaning in astrology. Here's everything to know, including how they affect your daily life.

This process, called accretion, is how everything in the solar system – planets, moons, comets and asteroids – came into being. The ice line ...