The Korea Institute of Fusion Energy’s (KFE) Korea Superconducting Tokamak Advanced Research (KSTAR) fusion reactor has reached temperatures seven times that of the Sun’s core. The researchers managed to maintain temperatures of 212 degrees Fahrenheit for 48 seconds. They also maintained the reactor's high confinement mode for over 100 seconds. Creating technology that can maintain high-temperature and high-density plasmas for extended periods is crucial for fusion.