April’s planetary parade has fewer planets. Only four will line up: Venus, Saturn, Mercury and Neptune. April's parade of ...

Starting tomorrow and continuing through April 25th, the planet Mercury will be visible to the naked eye in our sky.

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 will go into retrograde three times, bringing its characteristic disruptions and introspective energies. Mercury retrograde occurs when the planet Mercury appears to move backward in its ...