The formation and evolution of stars and planets and their connection to the origin of life on Earth will be explored at the University of Colorado at Â鶹ӰԺ's Fiske Planetarium in September. John Bally, a professor in the astrophysical and planetary sciences department, will present "The Birth of Stars and Planets" on Thursday, Sept. 1, and Friday, Sept. 2, at 7:30 p.m. Bally's talk is part of the planetarium's fall 2005 schedule of astronomy presentations given by CU-Â鶹ӰԺ professors and guest lecturers.