{"id":623627,"date":"2026-01-18T22:05:45","date_gmt":"2026-01-18T21:05:45","guid":{"rendered":"https:\/\/cronologia-universale.it\/september-1-1942\/"},"modified":"2026-01-18T22:05:45","modified_gmt":"2026-01-18T21:05:45","slug":"1939-15","status":"publish","type":"post","link":"https:\/\/cronologia-universale.it\/en\/1939-15\/","title":{"rendered":"1939"},"content":{"rendered":"<p>Hans Bethe publishes the article &#8220;Energy Production in Stars,&#8221; explaining the CNO (Carbon-Nitrogen-Oxygen) reaction that occurs in stellar nuclei. It will be understood only later that this occurs in stars heavier than the Sun, while for stars like our own Sun, the nuclear fusion reaction is similar but different (the so-called pp-chain reaction). Legend has it that Bethe, out walking with his girlfriend that evening, when she says to him, &#8220;Look at how beautiful the stars are,&#8221; he replies, &#8220;You know, I&#8217;m currently the only one on the planet who knows why they shine.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Hans Bethe publishes the article &#8220;Energy Production in Stars,&#8221; explaining the CNO (Carbon-Nitrogen-Oxygen) reaction that&#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":[43],"tags":[],"class_list":["post-623627","post","type-post","status-publish","format-standard","hentry","category-vg-en"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>1939 - Cronologia Universale<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/cronologia-universale.it\/en\/1939-15\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"1939 - Cronologia Universale\" \/>\n<meta property=\"og:description\" content=\"Hans Bethe publishes the article &#8220;Energy Production in Stars,&#8221; 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