🌐EnglishEnglishEspañolFrançaisItalianoPolskiPortuguêsРусскийไทย中文日本語EntityQ2561743· pop 14· linked from 97 articleschronology protection conjectureconjecture that the laws of physics prevent closed timelike curvesAvailable in 14 languagesEspañolFrançais中文РусскийPortuguêsItalianoCatalanMalayalamPolskiConnectionstemporal paradoxEntityStephen HawkingPersonCategoriesCausalityConjecturesTime in physicsTime travel