It is a world of extremes. Explore facts about our solar system's fastest planet. Mercury is slightly larger than our Moon - 15,329 kilometres around its equator. Its radius, the distance from the ...

A large metallic core takes up 85% of Mercury’s radius, and it’s also the least explored of the solar system’s terrestrial planets. The last completed mission to Mercury, NASA’s MESSENGER ...

Mercury is nobody's favorite planet. Our star's closest companion is a hateful little ball pocked with craters and patches of graphite, continually blasted by solar wind. But according to a recent ...