The planet Mercury is the closest planet to the sun, and also the most difficult for spacecraft to visit and explore. This is ...

Add Yahoo as a preferred source to see more of our stories on Google. (Left) A colorful view of Mercury produced using images from the color base map imaging campaign during MESSENGER's primary ...

ESA's Solar Orbiter captured views of the planet Mercury passing in front of the Sun. Multiple instruments aboard the ...

CAPE CANAVERAL, Fla. (AP) – The only spacecraft ever to orbit Mercury ended its four-year tour with a crash landing Thursday. NASA’s Messenger plunged from orbit as planned and slammed into the sun’s ...

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The solar system’s smallest planet may have vast riches beneath its surface, according to a stunning discovery by a NASA spacecraft. Scientists have determined that Mercury, the closest planet to the ...

Mercury is a mysterious world. As the closest planet to the sun, it’s a hard-to-reach destination for space missions. So far, only two have made it to Mercury—NASA’s Mariner 10 and MESSENGER ...

Add Yahoo as a preferred source to see more of our stories on Google. On May 15, 1963, NASA astronaut Gordon Cooper launched on the sixth and final crewed flight of the Mercury Program. This was also ...