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 ...

From the scorching surface of Mercury to the icy edges of Neptune, our planetary neighborhood is full of wonders. The order of the planets isn't just trivia—it tells a story about temperature, ...

Snapchat Planets, part of the Snapchat Plus Friend Solar System, ranks you in a friend’s top 8 based on your interactions, from Mercury (#1) to Neptune (#8). Each friend has their own solar system ...