Plasma:

"Plasma, the fourth state of matter, is hot electrified material. Most of the plasma from the Sun is ionized hydrogen, helium that has lost both electrons (alpha particles) and enough electrons so that the plasma is neutral. Another way of thinking of this plasma is that it is made of protons, electrons and helium nuclei (2 protons and 2 neutrons). As important as the plasma is, its density when it reaches Earth is usually very low + 6 particles or less in every cubic centimeter. "