SAN FRANCISCO, Feb 3 : Amazon's top cloud computing executive said space-based data centers are "pretty far" from being a reality, even as a number of startups and the company's own founder, Jeff Bezos, have pursued the idea. The explosive growth of artificial intelligence requires vast amounts of computing power and cooling, straining the capacity of land-based data centers. That has pushed cloud computing firms to consider alternatives, such as sending the equipment to space where terrestrial