In this Second Expanded Edition, Mass Quantization and Multidimensionality: 3I/ATLAS and the Great Extraterrestrial Contact takes readers on a journey where cutting-edge science, philosophy, and spirituality converge. The discovery of the interstellar comet 3I/ATLAS by the James Webb Space Telescope raises profound questions: is this merely a cosmic event, or a harbinger of a planetary transition and the long-anticipated Great Contact with extraterrestrial civilizations? Maurício Araquam de Sousa proposes a daring paradigm, where the laws of mass quantization not only explain the mysteries of physics-dark matter, multidimensionality, quantum densities-but also open the way to understanding the continuity of life beyond the physical body, astral civilizations, and higher planes of existence. Bridging the insights of Rudolf Steiner, Allan Kardec, Chico Xavier, Waldo Vieira, and Laércio Fonseca with modern astrophysics, this expanded edition explores: the origins and destiny of human consciousness, the interconnection between quantum science and spirituality, and the possibility of humanity's integration into a galactic family of intelligences. At once speculative and rigorously argued, this book is more than a treatise on physics or mysticism. It is a manifesto for awakening-an invitation to reimagine our place in the cosmos and to prepare for the transformations that may soon redefine life on Earth.