Four of Earth’s neighbors are about to appear in a planetary alignment. Those four planets — Mercury, Venus, Neptune and ...

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.

"What surprised us, at the end, was how effective this type of impact could be in explaining Mercury's unusual structure ...

Because Mercury is the closest planet to the Sun ... and how we relate and respond to the world at large. Trash-talking or sonnet-spinning, Mercury reveals the style of transmission we favor ...