Mercury has made a rare transit, where the planet passes across the face of the Sun as seen from Earth. During the transit, Mercury appeared as a dark silhouetted disc against the bright surface ...

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 and Venus are both rocky planets ... enough to capture the entire planet It is about five times the distance from the Sun that Earth is and eleven times the width of Earth.

The truth, however, is way more interesting. It's not exactly rare. That’s because Mercury orbits the sun every 88 days. An inner planet to Earth—so closer to the sun—it completes just over ...