Marla has learned from reading several tabloid magazines that gamma rays are dangerous and cause cancer. She has also learned are produced by supernova explosions, black holes, neutron stars and pulsars in space. Marla should NOT be worried about gamma ray exposure from these cosmic sources because.. A. The moon blocks cosmic gamma ray. B. Earth atmosphere blocks cosmic gamma rays C. cosmic gamma rays occur at wavelengths that are not harming to humans. D. Cosmic gamma rays lose most of their energy while traveling through space