From StarTalk.

The discussion centers around plasma, described as the fourth state of matter and the most abundant form in the observable universe. The conversation explains plasma as a soup of freely moving charged particles and explores its connection to fusion energy, such as that generated in the sun. The speakers clarify that while plasma can exist at different temperatures (including cold plasma), achieving fusion requires extremely high temperatures to overcome the repulsion between positively charged particles like protons.

From ‘Neil & a Plasma Physicist Discuss the Future of Fusion Energy’: https://youtu.be/kf4NyRbvkmM?si=UAzRA-hLCC-_h6Vn

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