This lavishly illustrated book introduces the sun, its physics, and its impact on life here on Earth. Using the most recent results based on radio telescope and satellite observations, the author describes the sun's awesome nuclear energy processes, its mysterious neutrino flux, its seismic activity, its magnetic fields and sunspots, its corona, solar flares and prominences, the solar wind, and the hugely important and multifaceted role of sunlight in both sustaining and endangering life on Planet Earth. Written in a light and friendly style, this is a delightful book for all who wish to understand the latest discoveries about the sun. It would make an ideal gift for all students of astronomy and related disciplines as well as for amateur astronomers.