Life in the Universe: Expectations and Constraints - Hardcoverby Dirk Schulze Makuch (Author), Louis N. Irwin (Author) Examines each of these parameters in crucial depth and makes the argument that life forms we would recognize may be more common in our solar system than many assume. Considers exotic forms of life that would not have to rely on carbon as the basic chemical element, solar energy as the main energy source, or water as the primary solvent and the question of detecting bio and geosignatures of such