A new dwarf planet, discovered beyond Neptune and described as Pluto's 'cousin,' could void the hypothesis of a Planet X in ...

On May 21, the International Astronomical Union’s Minor Planet Center announced the discovery of 2017 OF 201, which, because ...

The lone planet confirmed to be in the system is squeezed in between the two, orbiting at a distance similar to Earth's distance from the Sun. And, as an added bonus, the planet is orbiting backward ...

Even at the present time, when humanity possesses extremely modern giant ground observatories, as well as advanced space ...

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 closer ...

Astronomers have found new evidence that a mysterious ninth planet may be hiding at the edge of the solar system - rewriting what we know about the cosmos again. An international team from Taiwan ...

Pictured: Museum employees place symbol for "no" over the planet Pluto sign at the entrance to the Exploring the Planets gallery in 2006. Pluto had just been downgraded from full planet to dwarf ...

Tatooine-Like Planet Outside the Solar System May Orbit Two Failed Stars, Scientists Say NEW YORK (AP) — A new Tatooine-like planet outside the solar system may orbit two failed stars ...

This distant orbathing red dwarf star, at about 47 light-years distance from Earth, presents unique planetary attributes different from all known solar system planets. Scientific classification names ...

A star symbol covers the star HR 8799, whose light has been blocked. No, they don't contain the stunning detail we see on the close by planets in our solar system. Even so, you're seeing far-off ...

But that includes exoplanets, alien worlds that orbit alien suns. Only eight planets call our solar system home. Or there might still be nine if some astronomers are correct about an as-yet ...