The United States followed in January 1958 with the 31 - pound satellite
Explorer I. Even as the nascent U.S.
space program focused on pint -
size payloads, however, a research team at an obscure division of the General Dynamics Corporation was secretly drawing up plans for a monstrous 4,000 - ton spaceship that would be powered by the sequential explosions of thousands of hydrogen bombs and would ferry hundreds of astronauts at a time across the solar system.
The report also found that its
Explorer program that has supported small - and medium -
sized missions such as NASA's Wide - Field Infrared Survey
Explorer (WISE) ranked second in priority for large - cost
space projects.