China’s “Sun” Gets Hotter

Scientists in China say their “artificial sun” has pushed fusion research past another major barrier.

The machine is called the Experimental Advanced Superconducting Tokamak, better known as EAST. It is a fusion reactor in Hefei, China, designed to copy the process that powers the sun. Instead of burning coal, oil or gas, fusion joins atoms together and releases enormous energy.

The dream is clean, powerful energy with little carbon pollution.

According to recent reports, EAST reached plasma densities 1.3 to 1.65 times higher than the Greenwald Limit, a long-standing theoretical boundary in fusion science. Plasma is the superheated, electrically charged gas used in fusion reactions. If it gets too dense, it can become unstable and collapse.

That is why the new result matters. Scientists reportedly achieved the breakthrough by carefully controlling fuel gas pressure and microwave heating at startup, keeping the plasma stable at densities once thought too difficult to manage.

The record follows another major EAST achievement in 2025, when the reactor sustained a plasma loop for more than 1,000 seconds — about 17 minutes. That means scientists were able to contain material hotter than the sun for far longer than most people would expect.

Fusion energy is still not ready to power homes. Commercial fusion remains years away, and researchers must still solve major engineering problems, including how to produce more energy than the system uses, protect reactor materials, and operate safely for long periods.

But each record brings the field a little closer.

Fusion is attractive because its fuel could be abundant, its emissions would be low, and it would not depend on the weather the way solar and wind power do. If scientists can make it practical, it could become one of the most important energy technologies ever developed.

For now, the artificial sun remains in Hefei, where it is doing serious work for science — and very little for anyone’s summer tan.