Artist's impression of Planet Nine – a suspected “wide-orbit” planet – with the Sun in the distance; Neptune's orbit is shown ...

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

How Many Planets Are There in the Solar System? There are 8 planets in our solar system. The planets orbit the Sun in ...

In the remote outer reaches of planetary systems, far beyond the orbit of known planets, enormous and mysterious worlds ...

Stars passing close to the sun could cause planets to collide, including with Earth, or even be ejected as rogue planets, new ...

If our solar system seems stable, it's because our short lifespans make it seem that way. Earth revolves, night follows day, ...

The orange dwarf Gliese 710 is expected to come within 0.1663 light-years or 10,520 astronomical units in about 1.29 million ...

Astronomers discovered that C/2014 UN271, a massive comet more than 10 times larger than any known comet, is emitting jets of ...

Space artists can sometimes stretch scientific data for a bigger visual bang. At New York's natural history museum, they ...

For decades it was thought that water was prevalent in the outer reaches of the Solar System early in its history, with comets and asteroids delivering moisture to Earth and the inner planets during ...

Scientists have unlocked one of the solar system's many secrets from an unexpected source: a planetarium show.