Okay, I need to create a Wikipedia-style document about the gravitational wave event GW150914 under the categories of Science > Astronomy > Gravitational Wave Events. Let me start by understanding what's required.

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

Starting with the title: "GW150914" as H1. Then an introduction that briefly explains what GW150914 is, when it was detected, its significance.

Next sections could include the discovery details (date, detectors involved), physics behind it (binary black hole merger), detection process (LIGO's role), scientific implications, and maybe a section on subsequent research or related events.

I need to make sure each section has H2 headings. For example, "Discovery Details", "Physics of the Event", "Detection Process", "Scientific Implications". Under these, H3 could be sub-sections like "Date and Location" under Discovery Details, or "Binary Black Hole Merger" under Physics.

I should check for technical terms: gravitational waves, LIGO, interferometers, black holes, spacetime, etc. Explain them briefly when first mentioned. For example, "gravitational waves are ripples in spacetime caused by massive accelerating objects."

Include some data points: the date was September 14, 2015; the event was from two black holes merging, with masses about 36 and 29 solar masses, resulting in a 62-solar-mass black hole. The distance is around 1.3 billion light-years.

Mention the significance: first direct detection of gravitational waves, confirmation of Einstein's predictions, opening new avenues in astronomy.

Need to avoid markdown formatting beyond what's specified. Use bold for key terms if needed, but maybe not too much. Also, ensure that each section flows logically and covers all necessary aspects without being redundant.

Check for accuracy: LIGO detected it, the detectors were Hanford and Livingston. The signal was named GW150914. The merger released energy equivalent to 3 solar masses in gravitational waves.

Include a references or related documents section with links to LIGO's website, the original paper, maybe other events like GW170817.

Make sure the language is clear and concise, avoiding overly complex sentences. Use bullet points for lists if needed, but since it's a wiki-style document, paragraphs are probably better unless specific data needs to be highlighted.

Also, check that all required elements are present: H1, intro, multiple H2 sections with H3s, references, proper formatting, and sufficient length. Let me count the characters as I go to ensure it meets 800+.