For the biographies or stories of the physicist Dirac and the astronomer Hubble, you can refer to the following resources: The Early Years: Einstein's Pioneer: American Physicist Dirac. The book was written by Isaac Asimov, the biographer of the physicist Einstein. It described Dirac's growth, academic achievements, and contributions from a young age, as well as his leadership in the field of physics in the 20th century. Hubble's biography, The Explorer's End: The Life of Astronomist Hubble. The book was written by the wife of the Astronomist Hubble, Julien Hubble, and described Hubble's academic achievements and career from a young age, as well as his experience leading the space telescope project.