qTells the story of how astronomers solved one of the most compelling mysteries in science and, along the way, introduces readers to fundamental concepts and cutting-edge advances in modern astronomyq--From publisher description.CHAPter9 ... Reading. a. Hertzsprung-Russell. (H-R). Diagram. The line spectrum of the companion is identical to that of Sirius in all respects . . . indicating that the companion of Sirius has a color index not appreciably different from that of theanbsp;...
|Title||:||How Old Is the Universe?|
|Author||:||David A. Weintraub|
|Publisher||:||Princeton University Press - 2011|