. . . . "Doubt"@en . "This begins around the time that World War I ended. The program follows astronomer Cecilia Payne's quest to find the recipe of the stars, utilizing tiny rainbow images to deduce their composition - 90% hydrogen. This has recently been thrown into doubt as astronomer Vera Rubin demonstrates."@en . . . . . . . . . . . . . "The ring of truth. Program 6, Doubt"@en . . "\"Doubt\" begins around the time that World War I ended. The program follows astronomer Cecilia Payne's quest to find the recipe of the stars, utilizing tiny rainbow images to deduce their composition - 90% hydrogen. This has recently been thrown into doubt as astronomer Vera Rubin demonstrates."@en . . .