The origin of Mercury, the closest planet to the sun, is mysterious in many ways. It has a metallic core, like Earth, but its core makes up a much larger fraction of its volume – 85% compared to 15% ...

Earth and Mercury are both rocky planets with iron cores, but Mercury’s interior differs from Earth’s in a way that explains why the planet has such a bizarre magnetic field, UCLA planetary physicists ...

Of Interest: This color image of Mercury’s limb captures Debussy, a crater 80 km (50 mi.) in diameter, as well as some if its extensive rays. The crater and its rays appear brighter than the ...