By Mara Johnson-Groh NASA's Goddard Space Flight Center Plasma – a fourth state of matter after solid, liquid, and gas where particles have split into charged ions and electrons – is the most common form of matter in the universe. It's somewhat rare on Earth, but it makes up 99% of the matter in the …
Probing a 100-Year-Old Theory of Plasma Motion for the First Time with NASA’s MMS
