Okay, I need to create a Wikipedia-style document about "열핵 반응" (nuclear fusion) under the categories of Science > Astronomy > Astrophysics. Let me start by understanding what nuclear fusion is. It's the process where atomic nuclei combine to form heavier elements, releasing energy. But wait, in stars, it's specifically about fusing hydrogen into helium. I should mention that.

First, the title will be "열핵 반응" as given. Then an overview section. I need to explain what nuclear fusion is, its importance in stars, and maybe a brief history. For the structure, H2 sections like "정의 및 기본 개념", "우주에서의 역할", "에너지 생성 메커니즘", "현재 연구와 응용" etc.

I should check if there are different types of fusion reactions. Like the proton-proton chain and the CNO cycle in stars. Also, mention the conditions required for fusion—extreme temperatures and pressures. Maybe include some examples like the Sun's process.

Need to make sure technical terms are explained. For instance, "핵력" (nuclear force) is the strong interaction that binds protons and neutrons. Also, explain why fusion releases energy—because of mass defect and Einstein's E=mc².

In the energy generation section, break it down into steps. Maybe use bullet points for clarity. Mention the role of quantum tunneling in overcoming Coulomb barriers.

For current research, talk about controlled nuclear fusion on Earth, like tokamaks and stellarators. Also, mention challenges like plasma confinement and achieving net energy gain.

Include references or related documents at the end. Maybe link to articles on stars, nuclear physics, or fusion technology.

Check for accuracy: Fusion in stars vs. artificial reactors. Make sure not to confuse with fission. Also, clarify that while the Sun uses proton-proton chain, more massive stars use CNO cycle.

Avoid any markdown except what's specified. Use H1, H2, H3. Maybe a table comparing different fusion processes? Or a diagram of the proton-proton chain? But since it's text-based, maybe describe it in words with bullet points.

Ensure the document is over 800 characters. Let me count: each section should have enough detail. Introduction, then several subsections with explanations, examples, and current research.

Need to use proper terminology but explain them. For example, "핵융합" (nuclear fusion) vs. "열핵 반응". Maybe clarify that they are the same thing here.

Check for flow: Start with definition, move to how it works in stars, then energy production mechanisms, then human applications and challenges. Conclude with significance and future prospects.

Make sure all information is accurate. For example, the Sun's core temperature is about 15 million degrees Celsius. Fusion requires overcoming Coulomb repulsion, which is why high temperatures are needed.

Also mention that fusion is the source of energy for stars, and without it, they wouldn't shine. Maybe touch on how elements heavier than helium are formed in supernovae or other stellar processes.

Avoid any subjective language. Keep it objective and factual. Use terms like "according to current theories" when necessary.

Double-check if there's anything I'm missing. The user wants a professional document, so structure is key. Each H2 section should have enough depth. Maybe include sub-sections under each H2 with H3 headings.

For example, under "에너지 생성 메커니즘", have H3 sections on proton-proton chain and CNO cycle. Under "현재 연구와 응용", maybe H3 on controlled fusion research and challenges.

Also, mention the difference between stellar fusion and terrestrial fusion projects. Highlight that while stars naturally sustain fusion, humans are trying to replicate it for energy production.

I think that's a solid outline. Now, write each section with clear explanations, use bullet points where appropriate, and ensure technical terms are explained.