This would have resulted in the formation of an around 0.62-mile (1 km) thick diamond layer that then continued to grow over ...

New research 1 exposes the stratosphere as a major driver of mercury pollution, challenging long-held beliefs that the layer below it, the troposphere, dictates global spread of the heavy metal.

The middle layer was characterized by the presence of sodium ... It is about a third closer to its star than our solar system's innermost planet Mercury is to the sun - so close that it completes an ...