Think you know your way around 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 ...

A newly studied solar system breaks the usual planet pattern, raising fresh questions about how rocky and gas planets form.

Add Yahoo as a preferred source to see more of our stories on Google. Are planets in the solar system that are closer to the Sun older than the ones further away? – Gavriel, age 10, Paducah, Kentucky ...