Step 1: Understand what nuclear fusion is. It is a process where two light atomic nuclei combine to form a heavier nucleus, releasing a large amount of energy.
Step 2: Identify the main applications of nuclear fusion. The two main applications are: powering hydrogen bombs and fueling stars.
Step 3: Recognize that hydrogen bombs use nuclear fusion to create a massive explosion.
Step 4: Realize that stars, including our sun, use nuclear fusion to produce energy and light, allowing them to shine.