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

Mercury is an odd little planet. The closest world to the Sun has some extreme surface structures, steep hills and cliffs, which have long been suspected to be the effect of the planet’s interior ...

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

An amazing variety of features cover the surface of Mercury, which likely formed when material in the planet's mantle (the layer just below the surface crust) melted and came to the surface ...

Two new maps of Mercury use novel techniques to map the chemical makeup of the crust and identify previously unknown formations on the planet's surface.

The squeezing of its crust created features such as wrinkle ridges—tight waves in the rock that form over time as the surface draws together. [First Photos of Mercury from Orbit (Gallery)] ...

Messenger is photographing every inch of Mercury's surface from orbit, and some of its early pictures have revealed huge expanses of volcanic deposits near the planet's north pole. These features ...

The topography (surface features) of a planet is shaped by internal forces and weathering—which in the case of Mercury is primarily from meteor impacts, since it lacks an atmosphere.

Mercury’s surface might not be quite so terra firma, at least on geologic timescales. Scientists have long suspected that many of Mercury’s signature terrains have been shaped by volcanic ...

New maps of Mercury show icy-looking craters Data from NASA's Messenger spacecraft bolsters the case that ice lines the inside of polar craters on Mercury.

The squeezing of its crust created features such as wrinkle ridges—tight waves in the rock that form over time as the surface draws together. [ First Photos of Mercury from Orbit (Gallery) ] ...

A rare type of meteorite found on Earth may have been a critical ingredient in the geologic recipe that shaped the surface of Mercury, new research shows. New experiments on a type of meteorite ...