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.

Here’s what you should know when you go outside to see for yourself: Yes, the planets are indeed lined up across our sky. No, ...

This may explain the strange properties of the orbits of our solar ... system some 4 billion years ago and warped the orbits of many planets. More NASA, ESA, Caltech / ISTOCK / GETTY IMAGES ...

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 ...