🌐EnglishEnglishDeutschFrançaisSvenskaTürkçeРусскийالعربية한국어中文日本語EntityQ5452017· pop 10· linked from 176 articlesfirewallAlso known as Black hole firewallhypothetical phenomenon where an observer falling into a black hole encounters high-energy quanta at the event horizonAvailable in 10 languagesFrançaisDeutsch中文日本語РусскийالعربيةTürkçeUkrainian한국어via Wikidata sitelinks · CC0Connectionsgravitational waveEntitystellar populationEntityCategoriesBlack holesQuantum gravityQuantum mechanical entropyTheorems in general relativity