To recreate the conditions of the sun and stars for the production of fusion energy on earth, scientists must accomplish three major tasks. They have already passed the first test by achieving the necessary temperatures. In some cases, they have attained temperatures as high as 510 million degrees, more than 25 times the temperature at the center of the sun.
Second, they need to demonstrate sustained reactions where substantial amounts of energy are produced.
The third major milestone for fusion would be operation of a demonstration fusion power plant.
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