Just seven times hotter than the sun was a fusion reactor.

The fusion reactor at Alab in Korea has just reached temperatures seven times higher than the sun, accomplishing the seemingly impossible. 

For over 20 seconds, this "artificial sun" maintained plasma at a temperature of 100 million degrees Celsius. 

Due to hardware restrictions, the Korea Superconducting Tokamak Advanced Research device was shut down after 30 seconds. 

 If you've ever seen Spider-Man 2, they may have stopped it in order to avoid producing the next Doc Ock. In order to make nuclear fusion power a reality,

In order to be used in a typical setting, nuclear fusion power would presumably need to be completely stable. This is still a significant development.

 Longer stabilisation periods will be possible once the hardware for the fusion reaction device is upgraded, according to project researcher Yong-Su Na. 

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