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.

The first Mercury retrograde of the year goes from Saturday, March 15 to Monday, April 7. Retrogrades are optical illusions ...

New images of the planet Mercury taken by a robotic spacecraft have just been released — and they show the scorched world in fascinating up-close detail. The European Space Agency (ESA ...

In its literal form, Mercury in retrograde means that planet Mercury is appearing to go backwards in its orbit for three weeks. But spiritually, those three little words have come to mean that ...