Expansion Tectonics is an alternative geological theory coined by researcher Dr. James Maxlow, which proposes that Earth has been continuously increasing in size throughout its geological history. Unlike conventional plate tectonics, which relies on the subduction of oceanic crust to maintain a roughly constant Earth radius, Expansion Tectonics holds that new crustal material is generated at mid-ocean ridges without any corresponding crustal destruction. Maxlow’s work, supported by detailed small-Earth reconstructions and quantitative modeling, suggests that the continents once formed a complete shell covering a much smaller Earth, and that the ocean basins are the direct result of planetary expansion over geological time. This category is a space for discussing the evidence, methodology, research, and implications of Expansion Tectonics, including its relationship to Earth’s deep interior processes, biological evolution, and the broader history of Expanding Earth hypotheses.