Have you ever wondered why all the planets in our solar system orbit the Sun in roughly the same flat plane? This fascinating phenomenon isn’t a coincidence but a direct result of how our solar ...

This explorer spacecraft is heading to a rare asteroid with a naked metal core. It could hold clues to how Earth began ...

There could be a ninth planet in our Solar System after all — and no, it’s not Pluto. Instead, it’s the theoretical Planet X, also called Planet Nine, a wide-orbit planet that would circle the Sun ...