Pluto was reclassified as a dwarf planet in 2006. Our solar system may have a ninth planet after all, researchers say. The possibility that an additional planet may be hidden far into the solar system ...

(The Conversation is an independent and nonprofit source of news, analysis and commentary from academic experts.) Curious Kids is a series for children of all ages. If you have a question you’d like ...

Scientists found two Earth-sized planets and a third candidate orbiting a nearby double star system, TOI-2267.

An international team of researchers has just revealed the existence of three Earth-sized planets in the binary stellar ...