What is the difference between thermonuclear fusion in stars and on Earth?

1) Thermonuclear fusion in stars is a natural process, but artificial on Earth.
2) In the stars, the synthesis of the hydrogen isotope protium into helium occurs, and on Earth, in laboratories in thermonuclear fusion, deuterium, tritium, and lithium are used.
3) Thermonuclear fusion in stars is a self-regulating process, and on Earth, controlled thermonuclear fusion is still a major scientific problem.

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