Kepler-452b revolves around a sun much like our own.
April 1, 2011|
By Richard P. Grant Fountain of Youth? Preston Estep discusses the role that telomeres play in the aging process. Courtesy of Preston Estep (Portrait) Telomeres are protective lengths of repetitive DNA at the end of chromosomes that shorten with each cell division. When a single telomere gets down to a critical length, it triggers a damage response that causes the cell to become quiescent. If enough cells in a tissue become quiescent or go into apoptosis, then