The images reveal a haunting view of this rocky world, often referred to as the "Problem Child of the Solar System" due to ...

In astronomy, what does retrograde mean? And what connection does it have to astrology? We explain how planets move across ...

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.

Have you ever seen the planet Mercury? Venus, of course ... About 34 light-years from the Sun, Pollux is the closest giant star to our Sun. At 20:05 Universal Time today our satellite will ...

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 ...

We view the night sky from a moving platform. Earth orbits the sun at a different rate than any other planet. When Mercury and Earth are at their closest, Mercury appears to go backward ...

Finally, there is speedy little Mercury, normally difficult to see because of its close proximity to the sun, but during the latter half of December it should be easy to pick out, low in the east ...