Anyone with any kind of planet-gazing past could tell ... Orbiter (MMO)—will together study Mercury’s origin and evolution, its interior structure, geology, composition and craters, its ...

In astronomy, what does retrograde mean? And what connection does it have to astrology? We explain how planets move across ...

Mercury, the closest planet to the Sun, is full of unsolved mysteries. Using data from NASA’s MESSENGER mission, scientists have uncovered stunning details about its surface, including ray systems and ...

Mercury has made a rare transit, where the planet passes across the face of the Sun as seen from Earth. During the transit, Mercury appeared as a dark silhouetted disc against the bright surface ...

Mercury has the shortest and fastest orbit around the Sun and experiences dramatic temperature changes as it rotates. It is a world of extremes. Explore facts about our solar system's fastest planet.