Okay, I need to create a Wikipedia-style document about "gas pressure" under the categories of Science → Astronomy → 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 headings, lists, tables, code blocks if needed, and at least 800 characters.

Starting with the title: "기체 압력" (Gas Pressure) as H1. Then an overview section explaining what gas pressure is, its importance in cosmology. Next sections could be definitions, physical principles, applications in astronomy, measurement methods, related concepts, and references.

For the definition part, I should explain gas pressure in terms of kinetic theory, maybe mention the ideal gas law PV = nRT. Then discuss how this applies to cosmic environments like stars or interstellar medium. Maybe include examples like stellar interiors or planetary atmospheres.

In the physical principles section, break down into sub-sections: molecular motion and collisions, temperature's role, volume effects. Use H3 headings for each. Explain how pressure relates to particle density and kinetic energy.

Applications in astronomy could cover stars (nuclear fusion), interstellar medium, planetary atmospheres. Maybe mention specific phenomena like solar wind or gas clouds.

Measurement methods might include instruments like barometers, spectroscopy techniques, or theoretical models. Also, discuss challenges in measuring cosmic pressures due to vast scales.

Related concepts: pressure in different states of matter, relation to other physical quantities (temperature, volume), and maybe compare with solid/liquid pressure.

Need to ensure technical terms are explained. For example, "kinetic theory" should be briefly defined. Use tables if possible, like a comparison between gas pressure in Earth vs. space environments. Maybe include equations but format them properly.

Check for accuracy: make sure the ideal gas law is correctly presented, and that applications in astronomy are relevant. Avoid any subjective language. Keep paragraphs concise for readability.

Also, ensure the document meets the 800-character minimum. Let me count the words as I go. Each section should be detailed enough but not too verbose. Use bullet points or numbered lists where appropriate, like steps in measurement methods or examples of applications.

Finally, add a references section with credible sources, maybe textbooks on astrophysics or cosmology. Make sure all sections flow logically from introduction to details to related topics.