🌐EnglishEnglishPortuguêsРусскийالعربية中文日本語EntityQ4780925· pop 6· linked from 17 articlesapparent horizonsurface that is the boundary between light rays that are directed outwards and moving outwards, and those directed outward but moving inwardAvailable in 6 languagesPortuguêsالعربيةCatalanFinnishUkrainianvia Wikidata sitelinks · CC0ConnectionsMilky WayEntityBlack holeConceptCategoriesMathematics of general relativityPhysical horizonsSpoken articles