The Artificial Sun Breaks a 40-Year Barrier.

Scientists at the Experimental Advanced Superconducting Tokamak (EAST) in Hefei achieved a milestone that many physicists once thought was impossible. The reactor, known as China’s artificial sun, successfully shattered the Greenwald density limit, a theoretical ceiling that has restricted nuclear fusion experiments for four decades. By stabilizing plasma at densities 30% beyond the traditional limit, the team has opened a practical pathway toward sustainable, near-limitless clean energy. This breakthrough is particularly exciting because fusion power increases with the square of the plasma density—meaning more fuel can now be packed into the reactor without the plasma becoming unstable and crashing.

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