{"id":626288,"date":"2026-01-18T23:35:08","date_gmt":"2026-01-18T22:35:08","guid":{"rendered":"https:\/\/cronologia-universale.it\/april-21-1972-2\/"},"modified":"2026-01-18T23:35:08","modified_gmt":"2026-01-18T22:35:08","slug":"1967-12","status":"publish","type":"post","link":"https:\/\/cronologia-universale.it\/en\/1967-12\/","title":{"rendered":"1967"},"content":{"rendered":"<p>Russian physicist Yakov Borisovich Zel&#8217;dovich estimates the energy density of the quantum vacuum and finds that it would make an immense contribution in the direction of the cosmological constant that causes the universe to expand.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Russian physicist Yakov Borisovich Zel&#8217;dovich estimates the energy density of the quantum vacuum and finds&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[29],"tags":[],"class_list":["post-626288","post","type-post","status-publish","format-standard","hentry","category-as-en"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - 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