Okay, I need to create a Wikipedia-style document about nuclear fusion reactions under the categories of Science, Astronomy, and Cosmology. Let me start by understanding the requirements.

First, the structure: H1 for the title, an overview section, several sections with H2 and H3 headings, and maybe references or related documents. The content needs to be accurate, objective, detailed enough, easy to read, and use technical terms with explanations. Also, markdown formatting with proper hierarchy, lists, tables, code blocks if needed, and at least 800 characters.

The title is "핵융합 반응" (Nuclear Fusion Reaction). Let me start by outlining the sections. The overview should introduce what nuclear fusion is, its importance in stars, and maybe a brief history. Then, I can have sections on the basics of nuclear fusion, types of reactions, conditions required, applications, challenges, and future prospects.

For each section, I need to make sure it's detailed. For example, under "핵융합 반응의 기본 원리" (Basic Principles of Nuclear Fusion), I should explain what fusion is, how it differs from fission, the role of mass defect and energy release via E=mc². Maybe include examples like hydrogen to helium.

In the types section, I can list different fusion reactions such as proton-proton chain, CNO cycle, deuterium-tritium, etc. Each with their conditions and products. Also mention why certain reactions are more common in stars versus other contexts.

Conditions required for fusion: high temperature and pressure, plasma state, overcoming Coulomb barrier. Maybe explain the concept of plasma and how it's achieved in stars vs. experimental reactors like tokamaks.

Applications: energy production (like in stars, nuclear power), medical uses, maybe some industrial applications. Also mention current research like ITER.

Challenges: technical difficulties in achieving and sustaining fusion, energy output vs input, material degradation, radiation issues. Maybe touch on the Lawson criterion or ignition.

Future prospects: potential for clean energy, technological advancements, international collaborations.

I need to ensure that each section has H2 headings, with H3 if necessary. For example, under "핵융합 반응의 기본 원리", maybe have an H3 about mass defect and E=mc².

Use technical terms but explain them. Like "Coulomb barrier" should be explained as the electrostatic repulsion between nuclei that must be overcome for fusion to occur.

Check for accuracy: make sure the reactions are correctly described, like the proton-proton chain in the Sun versus the CNO cycle in heavier stars. Also, mention the energy released per reaction and why it's significant.

Include a references section with sources like NASA, academic papers, or reputable websites. Maybe add a table comparing different fusion reactions (e.g., D-T vs D-D) with their conditions and products.

Avoid markdown code blocks unless there are equations, but since this is about nuclear physics, maybe include some basic equations in a code block if needed. However, the user didn't specify any specific equations, so perhaps not necessary here.

Check for length: 800 characters minimum. The example provided by the assistant was around 1200 words, which should be sufficient. Need to ensure each section is detailed enough without being too verbose.

Also, make sure the language is clear and concise, avoiding jargon where possible but using it when necessary with explanations. For instance, "plasma" can be explained as a state of matter consisting of ions and free electrons.

Finally, review for coherence and flow between sections, ensuring that each part logically follows the previous one and covers all aspects of nuclear fusion reactions in the context of astrophysics.