NASA’s Voyager 2 spacecraft took this image of Neptune while passing through the outer solar system. The ice giant’s Great Dark Spot and the companion bright smudge are visible, as well as other ...

TEMPE, Ariz. a Quick: What’s the order of the planets in the solar system? Need a little help? Maybe the following mnemonic rings a bell: “My Very Educated Mother Just Served Up Nine Pizzas.” It’s ...