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

The images help reveal more about the craters' complex history and Mercury's volcanic history ... BepiColombo is now planned to enter orbit in November 2026. The flyby, while providing epic ...

Mercury's "North Pole." A shot from MESSENGER's wide angle color lens. MESSENGER in orbit (artist's rendering). Now take a look at our own planet. Here are satellite photos of Hurricane Earl → ...

Mercury retrograde happens several times a year. The planet's apparent change in motion doesn't affect Earth, but does caused ...