{"product_id":"explore-alliance-presents-how-do-you-know-episode-28-dark-matter-part-1","title":"Explore Alliance Presents: How Do You KNOW? – Episode #28: 'Dark Matter Part 1'","description":"\u003cdiv title=\"Page 1\" class=\"page\"\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp class=\"page\" title=\"Page 1\"\u003eThe universe has always been mysterious and strange to us, but in fact it may be stranger than we can ever fathom. \u003cbr\u003e\u003cbr\u003eIn this episode of How Do You KNOW? Dr. Barth will guide us through Henrietta Swan Leavitt's discovery of the period–luminosity relationship for Cepheids, now known as \"Leavitt's law\", made the stars the first \"standard candle\" in astronomy, allowing astronomers like Edwin Hubble to make the determination that the Andromeda Nebula was indeed another galaxy. He then picks up on Georges Lemaître's application of Albert Einstein's theory of general relativity to cosmology leading to his \"primeval atom\" hypothesis. But wait there is so much more...\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e The activities and materials provided free for the How Do You Know? program are based upon Dr. Barth’s award-winning book: \u003ca style=\"font-family: -apple-system, BlinkMacSystemFont, 'San Francisco', 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif; font-size: 1.4em;\" title=\"Astronomy for Educators Free e-Book\" href=\"https:\/\/scholarworks.uark.edu\/oer\/2\/\" target=\"_blank\"\u003eAstronomy For Educators\u003c\/a\u003e. This book is used as a resource in more than 5,700 schools across the United States and in more than 50 countries world wide. The book is published as an Open Educational Resource Text by the University of Arkansas Library Press.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca title=\"How Do You KNOW? Index of Programs\" href=\"https:\/\/explorescientificusa.com\/pages\/explore-alliance-presents-how-do-you-know-with-dr-daniel-barth\"\u003eReturn to the How Do You KNOW? index of programs\u003c\/a\u003e. \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cdiv class=\"page\" title=\"Page 1\"\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":46518264168588,"sku":"sku-40689704730796","price":0.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0577\/5858\/0876\/files\/HowDoYouKnow_COLORcopy_43ada226-00db-4b60-a5d3-cb1d896bed08.png?v=1772695485","url":"https:\/\/gobekusa.com\/products\/explore-alliance-presents-how-do-you-know-episode-28-dark-matter-part-1","provider":"GobekUSA","version":"1.0","type":"link"}