Fusion: The energy of the universe, 2e is an essential reference providing basic principles of fusion energy from its history to the issues and realities progressing from the present-day energy crisis. The book provides detailed developments and applications for researchers entering the field of fusion energy research. This second edition includes the latest results from the National Ignition Facility at the Lawrence Radiation Laboratory at Livermore, California, and the progress on the International Thermonuclear Experimental Reactor (ITER) tokamak program at Cadarache, France. It offers comprehensive coverage of basic principles, detailed developments, and practical applications. The content is widely accessible, yet detailed enough to engage the technical reader. It details the initial discovery of nuclear fusion, current attempts to create nuclear fusion here on Earth, and today's concerns over future energy.