Learn how Pluto nearly kept its planet status in a proposed 12-planet Solar System as its demotion marks its 20th anniversary. Eight days before Pluto lost its planetary status, it appeared ready to ...

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 ...

On ‘Star Wars day’, researchers more than double the number of potential known ‘circumbinary’ planets like the fictional Tatooine, home to Luke Skywalker Astronomers have discovered 27 new potential ...