I WONDER - What Is A Nuclear Reaction?

The video tutorial explains two methods of extracting energy from atoms: fission and fusion. Fission involves splitting a large atom into smaller parts, releasing significant energy, and is the process used in nuclear power plants. Fusion, on the other hand, combines two small atoms to form a larger one, a process that powers stars like the sun. Scientists are working to replicate fusion on Earth, but it remains a complex challenge.

How do stars like our sun generate energy according to the text?

What challenges do scientists face in making fusion work on Earth?