Okay, I need to create a professional Wikipedia-style document about black holes under the categories of Science, Astronomy, and Cosmology. Let me start by understanding the user's 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.

Starting with the title: "블랙홀" as given. Then an overview section introducing what a black hole is, maybe its discovery, basic properties. Next sections could be formation, structure (event horizon, singularity), types (stellar-mass, supermassive, etc.), effects on spacetime, detection methods, and current research.

I should make sure each H2 has sub-sections with H3 where necessary. For example, under "구조", there can be H3 for event horizon and singularity. Also, include some technical terms like Schwarzschild radius, Hawking radiation, but explain them briefly.

Need to check if I have enough content to reach 800 characters. Let me outline the sections:

1. 제목: 블랙홀
2. 개요/소개
3. 형성 과정 (H2)
4. 별의 진화 단계 (H3)
5. 중력 붕괴 (H3)
6. 구조 (H2)
7. 이벤트 호라이즌 (H3)
8. 싱귤라리티 (H3)
9. 유형 (H2)
10. 별질량 블랙홀
11. 초거대 질량 블랙홀
12. 중간 질량 블랙홀
13. 시공간에 미치는 영향 (H2)
14. 중력 렌즈 효과
15. 시간 지연
16. 탐지 방법 (H2)
17. 간접 관측
18. 중력파
19. 현재 연구 및 이슈 (H2)
20. 참고 자료

Now, I need to flesh out each section with accurate information. For example, in the formation process, explain how massive stars end their lives as supernovae and collapse into black holes. Mention the Chandrasekhar limit. In structure, define event horizon and singularity, maybe mention the Schwarzschild radius.

For types, differentiate between stellar-mass (from star collapse), supermassive (in galaxy centers), and intermediate mass. Discuss how they form, like mergers or accretion.

In effects on spacetime, explain gravitational lensing and time dilation near black holes. For detection methods, talk about observing X-rays from accretion disks, gravitational waves from mergers, and the Event Horizon Telescope's image of M87*.

Current research could include topics like information paradox, quantum gravity, and recent discoveries. References might list key papers or observatories.

Need to ensure technical terms are explained. For example, Hawking radiation is a theoretical emission due to quantum effects near the event horizon. Also, mention that black holes themselves don't emit light but can be detected by their interaction with surrounding matter.

Check for flow and readability. Avoid overly complex sentences. Use bullet points or lists where appropriate, like in detection methods or types of black holes.

Make sure each section is detailed enough to meet the length requirement. Maybe add some examples, like Sagittarius A* as a supermassive black hole in our galaxy.

Avoid any markdown formatting beyond what's specified. Use H1, H2, H3 headings, and maybe tables if needed (though not sure if necessary here). Keep paragraphs concise.

Double-check facts: the event horizon is the point of no return, singularity is where density is infinite, etc. Also, mention that general relativity predicts black holes, but quantum mechanics introduces paradoxes like information loss.

Alright, putting it all together now.