The following is a summary of an article by Prof. Pisin Chen, director of NTU’s Leung Center for Cosmology and Particle Astrophysics. We learn about the universe by observing fundamental particles that act as messengers of their origins. Unfortunately, a large fraction of the cosmic volume is not accessible with charged particles, such as protons. There is, however, the possibility that neutrinos, a necessary by-product of the Greisen-Zatsepin-Kuzmin (GZK) process, could reach Earth from deep space.
