{"product_id":"explore-alliance-presents-how-do-you-know-episode-27-ultra-diffuse-galaxies","title":"Explore Alliance Presents: How Do You KNOW? – Episode #27: 'Ultra Diffuse Galaxies'","description":"\u003cdiv class=\"page\" title=\"Page 1\"\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cdiv title=\"Page 1\" class=\"page\"\u003e\n\u003cp class=\"column\"\u003e\u003cmeta charset=\"utf-8\"\u003eUltra-diffuse galaxies are generally quenched dwarf galaxies with no gas reservoirs, they are therefore unable to form new stars; as a result, the star population in such galaxies is very old, similar to what we see in globular clusters.\u003c\/p\u003e\n\u003cp class=\"column\"\u003e\u003cspan\u003eDr. Barth walks us through the discovery of UDGs by \u003cmeta charset=\"utf-8\"\u003eAllan Sandage and Bruno Binggeli in 1984. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"layoutArea\"\u003eThe activities and materials provided free for the How Do You Know? program are based upon Dr. Barth’s award-winning book: \u003ca href=\"https:\/\/scholarworks.uark.edu\/oer\/2\/\" title=\"Astronomy for Educators Free e-Book\" style=\"font-family: -apple-system, BlinkMacSystemFont, 'San Francisco', 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif; font-size: 1.4em;\" 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\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/explorescientificusa.com\/pages\/explore-alliance-presents-how-do-you-know-with-dr-daniel-barth\" title=\"How Do You KNOW? Index of Programs\"\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 title=\"Page 1\" class=\"page\"\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":46518264594572,"sku":"sku-40664585994412","price":0.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0577\/5858\/0876\/files\/HowDoYouKnow_COLORcopy_78567205-2807-4443-a521-08430081727f.png?v=1772695486","url":"https:\/\/gobekusa.com\/products\/explore-alliance-presents-how-do-you-know-episode-27-ultra-diffuse-galaxies","provider":"GobekUSA","version":"1.0","type":"link"}