Impulse Space, a startup founded by a former SpaceX employee, has successfully raised $500 million in its Series D funding round, achieving a valuation of $4.26 billion. The funding will be used to build a fleet of space tugs for orbital maneuvering and to hire engineers as the company focuses on enhancing in-space mobility infrastructure. This substantial investment highlights the growing interest in space technology and the demand for orbital transportation solutions as the space economy evolves.