🌐EnglishEnglishEspañolРусскийالعربية中文日本語EntityQ5244742· pop 7· linked from 33 articlesDe Sitter double star experimentAvailable in 7 languagesEspañol中文РусскийالعربيةCatalanMacedonianvia Wikidata sitelinks · CC0ConnectionslightEntityInternational Standard Book NumberEntityCategories1913 in sciencePhysics experiments