Stargazers will be treated to a rare seven-planet alignment in February. This is what scientists hope to learn.

A European-Japanese spacecraft has beamed back some of the best close-up photos yet of Mercury's north pole as part of only the second human survey of our solar system's innermost planet. The ...

In January, you have the opportunity to take in four bright planets—Jupiter, Mars, Venus, and Saturn—in a single sweeping view each night. (Neptune and Uranus will also be there, but not ...