An curved arrow pointing right. This is the first complete topographic map of Mercury. It reveals the lowest and highest points on the planet as well as unprecedented detail Mercury's north pole.

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.

Mercury is known as “a personal planet,” similar to Venus and Mars. This is because they are closer to the sun and the earth astronomically, while astrologically, Thomas says they “align ...