Mercury is an odd little planet. The closest world to the Sun has some extreme surface structures, steep hills and cliffs, ...

As the closest planet to the Sun, Mercury is exposed to the star's enormous gravitational field. And it's really stressful.

Most meteorites that have reached Earth come from the asteroid belt between Mars and Jupiter. But we have 1,000 or so ...

If Mercury’s geologic features do, in fact, count as glaciers, that means they’re common throughout our solar system, from the sun’s closest neighbor to the farthest dwarf, Pluto.