Book excerpt: Since antiquity, theology has frequently gone hand in hand with the study of the heavens. Speculation regarding the plurality of worlds, and the possibility of intelligent life beyond Earth, has posed questions for, and been stimulated by, Christian theology. Advancements in astronomy and astrophysics now reveal a vast universe containing trillions of galaxies. Each new exoplanet discovered brings with it a new context in which to consider the place of humanity, and the role of divinity in relation to creatures. In particular, the Christian doctrines of the incarnation and redemption must be understood afresh in light of the likelihood of extraterrestrial life. In Exotheology, Joel L. Parkyn examines the twin historic developments in scientific and theological thought on extraterrestrials from antiquity to the twenty-first century. In doing so he demonstrates a consistent pattern of theological formulations that allow for a distinct relation between Christianity and extraterrestrial life, but this has so far been without sufficient resolution. Applying concepts from anthropology, psychology and sociology to putative extraterrestrials, he explores in new depth the implications of contact, and argues for a 'divine pedagogy' of potential modalities of supernatural presence and action with extraterrestrial intelligences.