The formation of Mercury remains an unsolved mystery. The planet closest to the sun has a disproportionately large metallic ...

More such craters could be hiding in plain sight as they can quickly fill up with water and dirt, researchers say ...

Black holes have always been the divas of the cosmos. They are some of the most powerful and mysterious objects in the universe, leaving scientists with plenty of questions about their functions.

Our solar system is our immediate cosmic neighborhood. We know it well: the sun at the center; then the rocky planets Mercury, Venus, Earth, and Mars; and then the asteroid belt; followed by the gas ...