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Two substances that exist in the plasma state are:
1. **Stars:** Stars, including our sun, consist mainly of plasma. Plasma is the most common state of matter in the universe and is formed at extremely high temperatures and pressures in the cores of stars.
2. **Lightning:** During a lightning strike, the air around the electrical discharge becomes ionized, forming a plasma. The high energy of the lightning causes electrons to be stripped from atoms, creating a plasma state.
Plasma is the fourth state of matter, characterized by ionized particles where electrons are separated from their atoms. It is often found in environments with extremely high temperatures or energy.