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 ...

PRAGUE, Czech Republic — The universe really is expanding — astronomers are proposing to rewrite the textbooks to say that our solar system has 12 planets rather than the nine memorized by generations ...

It is a question that feels like it should have a straightforward answer: how many planets are there in our solar system? Since Pluto was relegated back down to dwarf planet status, almost everyone ...