However, the books themselves are not especially concerned with technological speculation, and in many ways read like fantasy adventures combined with themes of biblical and classical mythology. With the tenets of Christianity being accepted as fact, the story then moves on to various science fiction and fantasy tropes within that framework. Lewis' books belong to an uncommon genre which can be characterized as 'Theological science fiction' or 'Christian science fiction', i.e., they take the basic tenets of Christianity to be factually true: These include notions such as God's existence, his creation of the Universe and the fact that watches over everybody that Jesus really is the Son of God and He truly died on the cross in order to redeem Humanity Satan, known here as Bent Oyarsa, is present, trying all the time to tempt people into selling him their souls, and those who are so tempted suffer a very terrible Perdition and so on. The Earth's moon Sulva is also mentioned, as are the Dancers before the Threshold (asteroids), and the Malacandrian moons, although not by name. Other planets are mentioned, such as Viritrilbia (Mercury), Glundandra (Jupiter), Lurga (Saturn) and Neruval (either Uranus or Neptune).

The action in the books takes place on three planets - Thulcandra or Earth Malacandra or Mars and Perelandra or Venus. They are more occasionally referred to as the Planetary Trilogy or the Interplanetary Trilogy

A philologist named Elwin Ransom is the hero of the first two novels and an important character in the third. Lewis wrote the series before the better known The Chronicles of Narnia, and there is some overlap in some of the material. 'Space Trilogy' and 'Cosmic Trilogy' are unofficial names for the series, with the first two novels being planetary romances, and all three mixing space travel with Mediaeval cosmology and Christian theology. Lewis, consisting of (in chronological order) Out of the Silent Planet, Perelandra and That Hideous Strength. The Space Trilogy or Cosmic Trilogy is a series of science fiction novels by the Irish writer C.S.

Cs lewis books space trilogy