Mercury, the closest planet to the sun, is only slightly larger than Earth's moon and is pockmarked with craters. The planet is visible to the unaided eye and as such as has long been known to humans.

This is a photomosaic of images collected by Mariner 10 as it flew past Mercury. It shows the planet's southern hemisphere. The spacecraft took more than 7,000 images of Mercury, Venus, the Earth, and ...

Forbes contributors publish independent expert analyses and insights. The Universe is out there, waiting for you to discover it. 1.) Over 3 billion people could experience it. Wherever the Sun is ...

We have just entered a very favorable period for observing the so-called "elusive" planet Mercury. From now, until about May 13, you should be able to find it with not much difficulty. But how well do ...

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NASA's Messenger probe is set to make history tomorrow night (March 17), when — if all goes well — it will become the first spacecraft ever to enter into orbit around the planet Mercury. Messenger ...

Rockets roared to life on August 3, 2004, as an intrepid spacecraft launched from Cape Canaveral and set out to uncover mysteries about the Solar System’s smallest planet: Mercury. The Messenger craft ...