A century ago, nuclear physics entered astrophysics, giving birth to a new field of science referred to as Nuclear Astrophysics. With time, it developed at an impressive pace into a vastly inter- and multidisciplinary discipline bringing into its wake not only astronomy and cosmology, but also many other sub-fields of physics, especially particle, solid-state and computational physics, as well as chemistry, geology and even biology. The present Astronuclear Physics review focusses primarily on the facets of nuclear physics that are of relevance to astronomy and astrophysics, the theoretical aspects being of special concern here.