Mercury, Venus, and Mars sit within the same general neighborhood as Earth, yet each has followed a radically different path. One kept a magnetic field against the odds. Another trapped so much heat ...

Even at a glance, the planets in our solar system are wildly diverse. Huge and small, airless and densely packed with ...

Mercury is a small, rocky planet about which researchers know relatively little. Two missions, taking readings as they passed ...

Researchers have found that Mercury's low-iron, high-sulfur chemistry allows its magma to stay liquid at lower temperatures ...